161555410 has 8 divisors (see below), whose sum is σ = 290799756. Its totient is φ = 64622160.

The previous prime is 161555371. The next prime is 161555413. The reversal of 161555410 is 14555161.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 150724729 + 10830681 = 12277^2 + 3291^2 .

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

It is a super-2 number, since 2×161555410² = 52200301000536200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161555413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8077761 + ... + 8077780.

Almost surely, 2^161555410 is an apocalyptic number.

161555410 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161555410 is a deficient number, since it is larger than the sum of its proper divisors (129244346).

161555410 is a wasteful number, since it uses less digits than its factorization.

161555410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16155548.

The product of its (nonzero) digits is 3000, while the sum is 28.

The square root of 161555410 is about 12710.4449174685. Note that the first 3 decimals coincide. The cubic root of 161555410 is about 544.6370335216.

The spelling of 161555410 in words is "one hundred sixty-one million, five hundred fifty-five thousand, four hundred ten".