51206678500 has 48 divisors (see below), whose sum is σ = 112005299952. Its totient is φ = 20451552000.

The previous prime is 51206678491. The next prime is 51206678531. The reversal of 51206678500 is 587660215.

It can be written as a sum of positive squares in 8 ways, for example, as 24496006144 + 26710672356 = 156512^2 + 163434^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 253032 + ... + 407968.

It is an arithmetic number, because the mean of its divisors is an integer number (2333443749).

Almost surely, 2^51206678500 is an apocalyptic number.

51206678500 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 51206678500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56002649976).

51206678500 is an abundant number, since it is smaller than the sum of its proper divisors (60798621452).

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

51206678500 is a wasteful number, since it uses less digits than its factorization.

51206678500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155617 (or 155605 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 40.

The spelling of 51206678500 in words is "fifty-one billion, two hundred six million, six hundred seventy-eight thousand, five hundred".