161699562 has 12 divisors (see below), whose sum is σ = 350349090. Its totient is φ = 53899848.

The previous prime is 161699543. The next prime is 161699569. The reversal of 161699562 is 265996161.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 102394161 + 59305401 = 10119^2 + 7701^2 .

It is a super-2 number, since 2×161699562² = 52293496701983688, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (161699569) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4491637 + ... + 4491672.

Almost surely, 2^161699562 is an apocalyptic number.

161699562 is an abundant number, since it is smaller than the sum of its proper divisors (188649528).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161699562 is a wasteful number, since it uses less digits than its factorization.

161699562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8983317 (or 8983314 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 161699562 is about 12716.1142649789. The cubic root of 161699562 is about 544.7989742003.

It can be divided in two parts, 161699 and 562, that added together give a palindrome (162261).

The spelling of 161699562 in words is "one hundred sixty-one million, six hundred ninety-nine thousand, five hundred sixty-two".