51656615097 has 4 divisors (see below), whose sum is σ = 68875486800. Its totient is φ = 34437743396.

The previous prime is 51656615093. The next prime is 51656615141. The reversal of 51656615097 is 79051665615.

51656615097 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51656615097 - 2² = 51656615093 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51656615093) 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, 8609435847 + ... + 8609435852.

It is an arithmetic number, because the mean of its divisors is an integer number (17218871700).

Almost surely, 2^51656615097 is an apocalyptic number.

It is an amenable number.

51656615097 is a deficient number, since it is larger than the sum of its proper divisors (17218871703).

51656615097 is a wasteful number, since it uses less digits than its factorization.

51656615097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17218871702.

The product of its (nonzero) digits is 1701000, while the sum is 51.

The spelling of 51656615097 in words is "fifty-one billion, six hundred fifty-six million, six hundred fifteen thousand, ninety-seven".