661456368 has 50 divisors (see below), whose sum is σ = 1914450384. Its totient is φ = 220485024.

The previous prime is 661456357. The next prime is 661456409. The reversal of 661456368 is 863654166.

661456368 is a `hidden beast` number, since 6 + 6 + 1 + 4 + 5 + 636 + 8 = 666.

661456368 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 253896 + ... + 256487.

Almost surely, 2^661456368 is an apocalyptic number.

It is an amenable number.

661456368 is an abundant number, since it is smaller than the sum of its proper divisors (1252994016).

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

661456368 is a wasteful number, since it uses less digits than its factorization.

661456368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510403 (or 510388 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 661456368 is about 25718.7940619307. The cubic root of 661456368 is about 871.2987024751.

The spelling of 661456368 in words is "six hundred sixty-one million, four hundred fifty-six thousand, three hundred sixty-eight".