661763786456032 has 48 divisors (see below), whose sum is σ = 1409088234350160. Its totient is φ = 304118583892992.

The previous prime is 661763786455991. The next prime is 661763786456051. The reversal of 661763786456032 is 230654687367166.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3413590482 + ... + 3413784337.

It is an arithmetic number, because the mean of its divisors is an integer number (29356004882295).

Almost surely, 2^{661763786456032} is an apocalyptic number.

It is an amenable number.

661763786456032 is an abundant number, since it is smaller than the sum of its proper divisors (747324447894128).

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

661763786456032 is a wasteful number, since it uses less digits than its factorization.

661763786456032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6827375075 (or 6827375067 counting only the distinct ones).

The product of its (nonzero) digits is 1097349120, while the sum is 70.

The spelling of 661763786456032 in words is "six hundred sixty-one trillion, seven hundred sixty-three billion, seven hundred eighty-six million, four hundred fifty-six thousand, thirty-two".