661753324368 has 100 divisors (see below), whose sum is σ = 1922589633888. Its totient is φ = 219745604160.

The previous prime is 661753324357. The next prime is 661753324391. The reversal of 661753324368 is 863423357166.

661753324368 is a `hidden beast` number, since 6 + 6 + 1 + 7 + 533 + 2 + 43 + 68 = 666.

It is a super-3 number, since 3×661753324368³ (a number of 36 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 629898 + ... + 1311593.

Almost surely, 2^661753324368 is an apocalyptic number.

It is an amenable number.

661753324368 is an abundant number, since it is smaller than the sum of its proper divisors (1260836309520).

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

661753324368 is a wasteful number, since it uses less digits than its factorization.

661753324368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1941774 (or 1941759 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 54.

The spelling of 661753324368 in words is "six hundred sixty-one billion, seven hundred fifty-three million, three hundred twenty-four thousand, three hundred sixty-eight".