161635612 has 24 divisors (see below), whose sum is σ = 299117952. Its totient is φ = 76300800.

The previous prime is 161635583. The next prime is 161635613. The reversal of 161635612 is 216536161.

It is a super-2 number, since 2×161635612² = 52252142133229088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161635613) 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, 10813 + ... + 20980.

It is an arithmetic number, because the mean of its divisors is an integer number (12463248).

Almost surely, 2^161635612 is an apocalyptic number.

It is an amenable number.

161635612 is a deficient number, since it is larger than the sum of its proper divisors (137482340).

161635612 is a wasteful number, since it uses less digits than its factorization.

161635612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31869 (or 31867 counting only the distinct ones).

The product of its digits is 6480, while the sum is 31.

The square root of 161635612 is about 12713.5994903096. The cubic root of 161635612 is about 544.7271445101.

The spelling of 161635612 in words is "one hundred sixty-one million, six hundred thirty-five thousand, six hundred twelve".