51556496808 has 64 divisors (see below), whose sum is σ = 135833241600. Its totient is φ = 16262009280.

The previous prime is 51556496801. The next prime is 51556496861. The reversal of 51556496808 is 80869465515.

It is a super-2 number, since 2×51556496808² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (51556496801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 328023 + ... + 459033.

It is an arithmetic number, because the mean of its divisors is an integer number (2122394400).

Almost surely, 2^51556496808 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 51556496808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67916620800).

51556496808 is an abundant number, since it is smaller than the sum of its proper divisors (84276744792).

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

51556496808 is a wasteful number, since it uses less digits than its factorization.

51556496808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131902 (or 131898 counting only the distinct ones).

The product of its (nonzero) digits is 10368000, while the sum is 57.

The spelling of 51556496808 in words is "fifty-one billion, five hundred fifty-six million, four hundred ninety-six thousand, eight hundred eight".