636998051964 has 24 divisors (see below), whose sum is σ = 1493797782400. Its totient is φ = 211265684784.

The previous prime is 636998051951. The next prime is 636998051969. The reversal of 636998051964 is 469150899636.

It is a junction number, because it is equal to n+sod(n) for n = 636998051895 and 636998051904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636998051969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133372414 + ... + 133377189.

Almost surely, 2^636998051964 is an apocalyptic number.

It is an amenable number.

636998051964 is an abundant number, since it is smaller than the sum of its proper divisors (856799730436).

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

636998051964 is a wasteful number, since it uses less digits than its factorization.

636998051964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266749809 (or 266749807 counting only the distinct ones).

The product of its (nonzero) digits is 75582720, while the sum is 66.

The spelling of 636998051964 in words is "six hundred thirty-six billion, nine hundred ninety-eight million, fifty-one thousand, nine hundred sixty-four".