51005561100 has 72 divisors (see below), whose sum is σ = 158928109200. Its totient is φ = 12555214080.

The previous prime is 51005561099. The next prime is 51005561107. The reversal of 51005561100 is 116550015.

It is not an unprimeable number, because it can be changed into a prime (51005561107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6535275 + ... + 6543074.

It is an arithmetic number, because the mean of its divisors is an integer number (2207334850).

Almost surely, 2^51005561100 is an apocalyptic number.

51005561100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51005561100 is an abundant number, since it is smaller than the sum of its proper divisors (107922548100).

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

51005561100 is a wasteful number, since it uses less digits than its factorization.

51005561100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13078379 (or 13078372 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 24.

The spelling of 51005561100 in words is "fifty-one billion, five million, five hundred sixty-one thousand, one hundred".