51551510155605 has 24 divisors (see below), whose sum is σ = 89387183578680. Its totient is φ = 27484528705920.

The previous prime is 51551510155601. The next prime is 51551510155667. The reversal of 51551510155605 is 50655101515515.

51551510155605 is a `hidden beast` number, since 5 + 1 + 5 + 5 + 15 + 10 + 15 + 5 + 605 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3456855184644 + 48094654970961 = 1859262^2 + 6935031^2 .

It is not a de Polignac number, because 51551510155605 - 2² = 51551510155601 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51551510155601) 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, 200079070 + ... + 200336559.

It is an arithmetic number, because the mean of its divisors is an integer number (3724465982445).

Almost surely, 2^{51551510155605} is an apocalyptic number.

It is an amenable number.

51551510155605 is a deficient number, since it is larger than the sum of its proper divisors (37835673423075).

51551510155605 is a wasteful number, since it uses less digits than its factorization.

51551510155605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400418501 (or 400418498 counting only the distinct ones).

The product of its (nonzero) digits is 468750, while the sum is 45.

The spelling of 51551510155605 in words is "fifty-one trillion, five hundred fifty-one billion, five hundred ten million, one hundred fifty-five thousand, six hundred five".