51518417364561 has 16 divisors (see below), whose sum is σ = 78647772882944. Its totient is φ = 29385276442704.

The previous prime is 51518417364553. The next prime is 51518417364563. The reversal of 51518417364561 is 16546371481515.

It is not a de Polignac number, because 51518417364561 - 2³ = 51518417364553 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51518417364563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2242454665 + ... + 2242477638.

It is an arithmetic number, because the mean of its divisors is an integer number (4915485805184).

Almost surely, 2^{51518417364561} is an apocalyptic number.

It is an amenable number.

51518417364561 is a deficient number, since it is larger than the sum of its proper divisors (27129355518383).

51518417364561 is a wasteful number, since it uses less digits than its factorization.

51518417364561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4484932860.

The product of its digits is 12096000, while the sum is 57.

The spelling of 51518417364561 in words is "fifty-one trillion, five hundred eighteen billion, four hundred seventeen million, three hundred sixty-four thousand, five hundred sixty-one".