61631888730 has 32 divisors (see below), whose sum is σ = 147965745600. Its totient is φ = 16429702272.

The previous prime is 61631888729. The next prime is 61631888749. The reversal of 61631888730 is 3788813616.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249675 + ... + 430814.

It is an arithmetic number, because the mean of its divisors is an integer number (4623929550).

Almost surely, 2^61631888730 is an apocalyptic number.

61631888730 is an abundant number, since it is smaller than the sum of its proper divisors (86333856870).

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

61631888730 is a wasteful number, since it uses less digits than its factorization.

61631888730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683518.

The product of its (nonzero) digits is 1161216, while the sum is 51.

The spelling of 61631888730 in words is "sixty-one billion, six hundred thirty-one million, eight hundred eighty-eight thousand, seven hundred thirty".