961984136820 has 48 divisors (see below), whose sum is σ = 3078349239168. Its totient is φ = 219882088320.

The previous prime is 961984136801. The next prime is 961984136833. The reversal of 961984136820 is 28631489169.

It is a congruent number.

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, 1145218791 + ... + 1145219630.

It is an arithmetic number, because the mean of its divisors is an integer number (64132275816).

Almost surely, 2^961984136820 is an apocalyptic number.

It is an amenable number.

961984136820 is an abundant number, since it is smaller than the sum of its proper divisors (2116365102348).

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

961984136820 is a wasteful number, since it uses less digits than its factorization.

961984136820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2290438440 (or 2290438438 counting only the distinct ones).

The product of its (nonzero) digits is 4478976, while the sum is 57.

The spelling of 961984136820 in words is "nine hundred sixty-one billion, nine hundred eighty-four million, one hundred thirty-six thousand, eight hundred twenty".