165661432 has 16 divisors (see below), whose sum is σ = 319010760. Its totient is φ = 80591904.

The previous prime is 165661409. The next prime is 165661471. The reversal of 165661432 is 234166561.

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, 279538 + ... + 280129.

Almost surely, 2^165661432 is an apocalyptic number.

It is an amenable number.

165661432 is a deficient number, since it is larger than the sum of its proper divisors (153349328).

165661432 is a wasteful number, since it uses less digits than its factorization.

165661432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559710 (or 559706 counting only the distinct ones).

The product of its digits is 25920, while the sum is 34.

The square root of 165661432 is about 12870.9530338666. The cubic root of 165661432 is about 549.2125723619.

The spelling of 165661432 in words is "one hundred sixty-five million, six hundred sixty-one thousand, four hundred thirty-two".