51025903640 has 64 divisors (see below), whose sum is σ = 116202146400. Its totient is φ = 20162976768.

The previous prime is 51025903639. The next prime is 51025903657. The reversal of 51025903640 is 4630952015.

It is a self number, because there is not a number n which added to its sum of digits gives 51025903640.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4397927 + ... + 4409513.

Almost surely, 2^51025903640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51025903640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58101073200).

51025903640 is an abundant number, since it is smaller than the sum of its proper divisors (65176242760).

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

51025903640 is a wasteful number, since it uses less digits than its factorization.

51025903640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12924 (or 12920 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The spelling of 51025903640 in words is "fifty-one billion, twenty-five million, nine hundred three thousand, six hundred forty".