661355296 has 24 divisors (see below), whose sum is σ = 1488049920. Its totient is φ = 283437888.

The previous prime is 661355269. The next prime is 661355309. The reversal of 661355296 is 692553166.

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, 1476016 + ... + 1476463.

It is an arithmetic number, because the mean of its divisors is an integer number (62002080).

Almost surely, 2^661355296 is an apocalyptic number.

It is an amenable number.

661355296 is an abundant number, since it is smaller than the sum of its proper divisors (826694624).

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

661355296 is a wasteful number, since it uses less digits than its factorization.

661355296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2952496 (or 2952488 counting only the distinct ones).

The product of its digits is 291600, while the sum is 43.

The square root of 661355296 is about 25716.8290424772. The cubic root of 661355296 is about 871.2543214231.

The spelling of 661355296 in words is "six hundred sixty-one million, three hundred fifty-five thousand, two hundred ninety-six".