661053272 has 16 divisors (see below), whose sum is σ = 1352154600. Its totient is φ = 300478720.

The previous prime is 661053257. The next prime is 661053293. The reversal of 661053272 is 272350166.

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, 3755897 + ... + 3756072.

Almost surely, 2^661053272 is an apocalyptic number.

It is an amenable number.

661053272 is an abundant number, since it is smaller than the sum of its proper divisors (691101328).

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

661053272 is a wasteful number, since it uses less digits than its factorization.

661053272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7511986 (or 7511982 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 661053272 is about 25710.9562638187. The cubic root of 661053272 is about 871.1216747286.

The spelling of 661053272 in words is "six hundred sixty-one million, fifty-three thousand, two hundred seventy-two".