661763661726700 has 36 divisors (see below), whose sum is σ = 1546490772561280. Its totient is φ = 244343505867840.

The previous prime is 661763661726683. The next prime is 661763661726721. The reversal of 661763661726700 is 7627166367166.

It is a super-2 number, since 2×661763661726700² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 254524483980 + ... + 254524486579.

Almost surely, 2^{661763661726700} is an apocalyptic number.

It is an amenable number.

661763661726700 is an abundant number, since it is smaller than the sum of its proper divisors (884727110834580).

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

661763661726700 is a wasteful number, since it uses less digits than its factorization.

661763661726700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509048970586 (or 509048970579 counting only the distinct ones).

The product of its (nonzero) digits is 96018048, while the sum is 64.

The spelling of 661763661726700 in words is "six hundred sixty-one trillion, seven hundred sixty-three billion, six hundred sixty-one million, seven hundred twenty-six thousand, seven hundred".