51944449644 has 18 divisors (see below), whose sum is σ = 131304025580. Its totient is φ = 17314816536.

The previous prime is 51944449639. The next prime is 51944449673. The reversal of 51944449644 is 44694444915.

It is a happy number.

51944449644 is a `hidden beast` number, since 5 + 194 + 4 + 449 + 6 + 4 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

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, 721450654 + ... + 721450725.

Almost surely, 2^51944449644 is an apocalyptic number.

It is an amenable number.

51944449644 is an abundant number, since it is smaller than the sum of its proper divisors (79359575936).

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

51944449644 is a wasteful number, since it uses less digits than its factorization.

51944449644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1442901389 (or 1442901384 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 54.

The spelling of 51944449644 in words is "fifty-one billion, nine hundred forty-four million, four hundred forty-nine thousand, six hundred forty-four".