661035172 has 24 divisors (see below), whose sum is σ = 1325422784. Its totient is φ = 282582432.

The previous prime is 661035161. The next prime is 661035209. The reversal of 661035172 is 271530166.

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, 18618 + ... + 40849.

Almost surely, 2^661035172 is an apocalyptic number.

It is an amenable number.

661035172 is an abundant number, since it is smaller than the sum of its proper divisors (664387612).

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

661035172 is a wasteful number, since it uses less digits than its factorization.

661035172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59875 (or 59873 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 661035172 is about 25710.6042713897. The cubic root of 661035172 is about 871.1137240602.

The spelling of 661035172 in words is "six hundred sixty-one million, thirty-five thousand, one hundred seventy-two".