51530025656 has 16 divisors (see below), whose sum is σ = 96905505840. Its totient is φ = 25688557440.

The previous prime is 51530025653. The next prime is 51530025671. The reversal of 51530025656 is 65652003515.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51530025653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9554060 + ... + 9559451.

It is an arithmetic number, because the mean of its divisors is an integer number (6056594115).

Almost surely, 2^51530025656 is an apocalyptic number.

It is an amenable number.

51530025656 is a deficient number, since it is larger than the sum of its proper divisors (45375480184).

51530025656 is a wasteful number, since it uses less digits than its factorization.

51530025656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19113854 (or 19113850 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 38.

The spelling of 51530025656 in words is "fifty-one billion, five hundred thirty million, twenty-five thousand, six hundred fifty-six".