51651566100 has 108 divisors (see below), whose sum is σ = 164116967196. Its totient is φ = 13585052160.

The previous prime is 51651566093. The next prime is 51651566149. The reversal of 51651566100 is 166515615.

It can be written as a sum of positive squares in 6 ways, for example, as 3549456 + 51648016644 = 1884^2 + 227262^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 327387 + ... + 458786.

Almost surely, 2^51651566100 is an apocalyptic number.

51651566100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51651566100 is an abundant number, since it is smaller than the sum of its proper divisors (112465401096).

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

51651566100 is a wasteful number, since it uses less digits than its factorization.

51651566100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786266 (or 786256 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 51651566100 in words is "fifty-one billion, six hundred fifty-one million, five hundred sixty-six thousand, one hundred".