51061100605500 has 48 divisors (see below), whose sum is σ = 148689924967584. Its totient is φ = 13616293494400.

The previous prime is 51061100605477. The next prime is 51061100605609. The reversal of 51061100605500 is 550600116015.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17020365369 + ... + 17020368368.

It is an arithmetic number, because the mean of its divisors is an integer number (3097706770158).

Almost surely, 2^{51061100605500} is an apocalyptic number.

51061100605500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51061100605500 is an abundant number, since it is smaller than the sum of its proper divisors (97628824362084).

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

51061100605500 is a wasteful number, since it uses less digits than its factorization.

51061100605500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34040733759 (or 34040733747 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 30.

The spelling of 51061100605500 in words is "fifty-one trillion, sixty-one billion, one hundred million, six hundred five thousand, five hundred".