161493556 has 24 divisors (see below), whose sum is σ = 324688896. Its totient is φ = 68846880.

The previous prime is 161493533. The next prime is 161493589. The reversal of 161493556 is 655394161.

It is a happy number.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9751 + ... + 20446.

It is an arithmetic number, because the mean of its divisors is an integer number (13528704).

Almost surely, 2^161493556 is an apocalyptic number.

It is an amenable number.

161493556 is an abundant number, since it is smaller than the sum of its proper divisors (163195340).

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

161493556 is a wasteful number, since it uses less digits than its factorization.

161493556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30399 (or 30397 counting only the distinct ones).

The product of its digits is 97200, while the sum is 40.

The square root of 161493556 is about 12708.0114888207. The cubic root of 161493556 is about 544.5675170643.

The spelling of 161493556 in words is "one hundred sixty-one million, four hundred ninety-three thousand, five hundred fifty-six".