51556655500 has 96 divisors (see below), whose sum is σ = 129476325888. Its totient is φ = 17567928000.

The previous prime is 51556655461. The next prime is 51556655539. The reversal of 51556655500 is 555665515.

It is an interprime number because it is at equal distance from previous prime (51556655461) and next prime (51556655539).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 525315 + ... + 615685.

It is an arithmetic number, because the mean of its divisors is an integer number (1348711728).

Almost surely, 2^51556655500 is an apocalyptic number.

51556655500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51556655500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64738162944).

51556655500 is an abundant number, since it is smaller than the sum of its proper divisors (77919670388).

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

51556655500 is a wasteful number, since it uses less digits than its factorization.

51556655500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90560 (or 90548 counting only the distinct ones).

The product of its (nonzero) digits is 562500, while the sum is 43.

The spelling of 51556655500 in words is "fifty-one billion, five hundred fifty-six million, six hundred fifty-five thousand, five hundred".