161557332 has 12 divisors (see below), whose sum is σ = 376967136. Its totient is φ = 53852440.

The previous prime is 161557327. The next prime is 161557351. The reversal of 161557332 is 233755161.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×161557332² = 52201543045916448, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161557293 and 161557302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6731544 + ... + 6731567.

It is an arithmetic number, because the mean of its divisors is an integer number (31413928).

Almost surely, 2^161557332 is an apocalyptic number.

161557332 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161557332 is an abundant number, since it is smaller than the sum of its proper divisors (215409804).

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

161557332 is a wasteful number, since it uses less digits than its factorization.

161557332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13463118 (or 13463116 counting only the distinct ones).

The product of its digits is 18900, while the sum is 33.

The square root of 161557332 is about 12710.5205243530. The cubic root of 161557332 is about 544.6391933342.

The spelling of 161557332 in words is "one hundred sixty-one million, five hundred fifty-seven thousand, three hundred thirty-two".