51499877520 has 640 divisors, whose sum is σ = 211666452480. Its totient is φ = 10049126400.

The previous prime is 51499877519. The next prime is 51499877521. The reversal of 51499877520 is 2577899415.

51499877520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51499877519) and next prime (51499877521).

It is a super-4 number, since 4×51499877520⁴ (a number of 44 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (51499877521) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 21904345 + ... + 21906695.

It is an arithmetic number, because the mean of its divisors is an integer number (330728832).

Almost surely, 2^51499877520 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 51499877520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105833226240).

51499877520 is an abundant number, since it is smaller than the sum of its proper divisors (160166574960).

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

51499877520 is a wasteful number, since it uses less digits than its factorization.

51499877520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2463 (or 2457 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 57.

The spelling of 51499877520 in words is "fifty-one billion, four hundred ninety-nine million, eight hundred seventy-seven thousand, five hundred twenty".