51689345900 has 18 divisors (see below), whose sum is σ = 112165880820. Its totient is φ = 20675738320.

The previous prime is 51689345879. The next prime is 51689345921. The reversal of 51689345900 is 954398615.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (51689345879) and next prime (51689345921).

It is a Harshad number since it is a multiple of its sum of digits (50).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 258446630 + ... + 258446829.

Almost surely, 2^51689345900 is an apocalyptic number.

51689345900 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51689345900 is an abundant number, since it is smaller than the sum of its proper divisors (60476534920).

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

51689345900 is a wasteful number, since it uses less digits than its factorization.

51689345900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516893473 (or 516893466 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 50.

The spelling of 51689345900 in words is "fifty-one billion, six hundred eighty-nine million, three hundred forty-five thousand, nine hundred".