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161663161 = 1167219353
BaseRepresentation
bin10011010001011…
…00100010111001
3102021012100011111
421220230202321
5312341210121
624013000321
74002054112
oct1150544271
9367170144
10161663161
1183288a20
12461830a1
132765379a
1417683209
15e2d52e1
hex9a2c8b9

161663161 has 8 divisors (see below), whose sum is σ = 178992864. Its totient is φ = 144772320.

The previous prime is 161663147. The next prime is 161663219. The reversal of 161663161 is 161366161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161663161 - 217 = 161532089 is a prime.

It is a super-2 number, since 2×1616631612 = 52269955249023842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161663261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108940 + ... + 110413.

It is an arithmetic number, because the mean of its divisors is an integer number (22374108).

Almost surely, 2161663161 is an apocalyptic number.

161663161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161663161 is a deficient number, since it is larger than the sum of its proper divisors (17329703).

161663161 is a wasteful number, since it uses less digits than its factorization.

161663161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219431.

The product of its digits is 3888, while the sum is 31.

The square root of 161663161 is about 12714.6828902651. The cubic root of 161663161 is about 544.7580903218.

The spelling of 161663161 in words is "one hundred sixty-one million, six hundred sixty-three thousand, one hundred sixty-one".

Divisors: 1 11 67 737 219353 2412883 14696651 161663161