51312165100 has 72 divisors (see below), whose sum is σ = 132787001088. Its totient is φ = 16827835200.

The previous prime is 51312165097. The next prime is 51312165197. The reversal of 51312165100 is 156121315.

It is a happy number.

51312165100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1577446 + ... + 1609645.

It is an arithmetic number, because the mean of its divisors is an integer number (1844263904).

Almost surely, 2^51312165100 is an apocalyptic number.

51312165100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51312165100 is an abundant number, since it is smaller than the sum of its proper divisors (81474835988).

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

51312165100 is a wasteful number, since it uses less digits than its factorization.

51312165100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3187135 (or 3187128 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 25.

Adding to 51312165100 its reverse (156121315), we get a palindrome (51468286415).

The spelling of 51312165100 in words is "fifty-one billion, three hundred twelve million, one hundred sixty-five thousand, one hundred".