51165510115217 has 4 divisors (see below), whose sum is σ = 51781962044400. Its totient is φ = 50549058186036.

The previous prime is 51165510115099. The next prime is 51165510115219. The reversal of 51165510115217 is 71251101556115.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51165510115217 - 2¹⁶ = 51165510049681 is a prime.

It is a super-2 number, since 2×51165510115217² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51165510115219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 308225964467 + ... + 308225964632.

It is an arithmetic number, because the mean of its divisors is an integer number (12945490511100).

Almost surely, 2^{51165510115217} is an apocalyptic number.

It is an amenable number.

51165510115217 is a deficient number, since it is larger than the sum of its proper divisors (616451929183).

51165510115217 is an equidigital number, since it uses as much as digits as its factorization.

51165510115217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616451929182.

The product of its (nonzero) digits is 52500, while the sum is 41.

The spelling of 51165510115217 in words is "fifty-one trillion, one hundred sixty-five billion, five hundred ten million, one hundred fifteen thousand, two hundred seventeen".