8156938857 has 8 divisors (see below), whose sum is σ = 10931126976. Its totient is φ = 5410354992.

The previous prime is 8156938831. The next prime is 8156938901. The reversal of 8156938857 is 7588396518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8156938857 - 2⁷ = 8156938729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8156938857.

It is not an unprimeable number, because it can be changed into a prime (8156938817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6900373 + ... + 6901554.

It is an arithmetic number, because the mean of its divisors is an integer number (1366390872).

Almost surely, 2^8156938857 is an apocalyptic number.

It is an amenable number.

8156938857 is a deficient number, since it is larger than the sum of its proper divisors (2774188119).

8156938857 is a wasteful number, since it uses less digits than its factorization.

8156938857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13802127.

The product of its digits is 14515200, while the sum is 60.

The square root of 8156938857 is about 90315.7730244280. The cubic root of 8156938857 is about 2012.9936379550.

The spelling of 8156938857 in words is "eight billion, one hundred fifty-six million, nine hundred thirty-eight thousand, eight hundred fifty-seven".