51250666644 has 36 divisors (see below), whose sum is σ = 130299157716. Its totient is φ = 16984804608.

The previous prime is 51250666583. The next prime is 51250666669. The reversal of 51250666644 is 44666605215.

It can be written as a sum of positive squares in 2 ways, for example, as 46402329744 + 4848336900 = 215412^2 + 69630^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 51250666644.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4108309 + ... + 4120764.

Almost surely, 2^51250666644 is an apocalyptic number.

It is an amenable number.

51250666644 is an abundant number, since it is smaller than the sum of its proper divisors (79048491072).

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

51250666644 is a wasteful number, since it uses less digits than its factorization.

51250666644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8229256 (or 8229251 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 45.

The spelling of 51250666644 in words is "fifty-one billion, two hundred fifty million, six hundred sixty-six thousand, six hundred forty-four".