51100561100 has 18 divisors (see below), whose sum is σ = 110888217804. Its totient is φ = 20440224400.

The previous prime is 51100561093. The next prime is 51100561147. The reversal of 51100561100 is 116500115.

It is a super-2 number, since 2×51100561100² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 255502706 + ... + 255502905.

Almost surely, 2^51100561100 is an apocalyptic number.

51100561100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51100561100 is an abundant number, since it is smaller than the sum of its proper divisors (59787656704).

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

51100561100 is a wasteful number, since it uses less digits than its factorization.

51100561100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511005625 (or 511005618 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 20.

The spelling of 51100561100 in words is "fifty-one billion, one hundred million, five hundred sixty-one thousand, one hundred".