720661761632 has 36 divisors (see below), whose sum is σ = 1440295354260. Its totient is φ = 354952737216.

The previous prime is 720661761577. The next prime is 720661761643. The reversal of 720661761632 is 236167166027.

720661761632 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 5 ways as a sum of consecutive naturals, for example, 2364782 + ... + 2652077.

It is an arithmetic number, because the mean of its divisors is an integer number (40008204285).

Almost surely, 2^720661761632 is an apocalyptic number.

It is an amenable number.

720661761632 is a deficient number, since it is larger than the sum of its proper divisors (719633592628).

720661761632 is an equidigital number, since it uses as much as digits as its factorization.

720661761632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5017003 (or 5016928 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 47.

The spelling of 720661761632 in words is "seven hundred twenty billion, six hundred sixty-one million, seven hundred sixty-one thousand, six hundred thirty-two".