161846690 has 16 divisors (see below), whose sum is σ = 293011128. Its totient is φ = 64363776.

The previous prime is 161846689. The next prime is 161846717. The reversal of 161846690 is 96648161.

It can be written as a sum of positive squares in 4 ways, for example, as 156975841 + 4870849 = 12529^2 + 2207^2 .

It is a super-2 number, since 2×161846690² = 52388702127912200, which contains 22 as substring.

It is an unprimeable number.

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, 45047 + ... + 48506.

Almost surely, 2^161846690 is an apocalyptic number.

161846690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161846690 is a deficient number, since it is larger than the sum of its proper divisors (131164438).

161846690 is a wasteful number, since it uses less digits than its factorization.

161846690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93733.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 161846690 is about 12721.8980502125. The cubic root of 161846690 is about 544.9641589089.

The spelling of 161846690 in words is "one hundred sixty-one million, eight hundred forty-six thousand, six hundred ninety".