7856134657 has 4 divisors (see below), whose sum is σ = 8978439616. Its totient is φ = 6733829700.

The previous prime is 7856134651. The next prime is 7856134733. The reversal of 7856134657 is 7564316587.

It is a happy number.

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 7856134657 - 2¹⁵ = 7856101889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7856134651) 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, 561152469 + ... + 561152482.

It is an arithmetic number, because the mean of its divisors is an integer number (2244609904).

Almost surely, 2^7856134657 is an apocalyptic number.

It is an amenable number.

7856134657 is a deficient number, since it is larger than the sum of its proper divisors (1122304959).

7856134657 is a wasteful number, since it uses less digits than its factorization.

7856134657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1122304958.

The product of its digits is 4233600, while the sum is 52.

The square root of 7856134657 is about 88634.8388445537. The cubic root of 7856134657 is about 1987.9386293058.

The spelling of 7856134657 in words is "seven billion, eight hundred fifty-six million, one hundred thirty-four thousand, six hundred fifty-seven".