161661612 has 24 divisors (see below), whose sum is σ = 431097856. Its totient is φ = 46189008.

The previous prime is 161661589. The next prime is 161661613. The reversal of 161661612 is 216166161.

It is a super-2 number, since 2×161661612² = 52268953588877088, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 161661612.

It is not an unprimeable number, because it can be changed into a prime (161661613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 962188 + ... + 962355.

Almost surely, 2^161661612 is an apocalyptic number.

161661612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161661612 is an abundant number, since it is smaller than the sum of its proper divisors (269436244).

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

161661612 is a wasteful number, since it uses less digits than its factorization.

161661612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1924557 (or 1924555 counting only the distinct ones).

The product of its digits is 2592, while the sum is 30.

The square root of 161661612 is about 12714.6219762917. The cubic root of 161661612 is about 544.7563504222.

The spelling of 161661612 in words is "one hundred sixty-one million, six hundred sixty-one thousand, six hundred twelve".