8157812705 has 8 divisors (see below), whose sum is σ = 11187857472. Its totient is φ = 5593928688.

The previous prime is 8157812669. The next prime is 8157812711. The reversal of 8157812705 is 5072187518.

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

It is a cyclic number.

It is not a de Polignac number, because 8157812705 - 2⁸ = 8157812449 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116540147 + ... + 116540216.

It is an arithmetic number, because the mean of its divisors is an integer number (1398482184).

Almost surely, 2^8157812705 is an apocalyptic number.

It is an amenable number.

8157812705 is a deficient number, since it is larger than the sum of its proper divisors (3030044767).

8157812705 is a wasteful number, since it uses less digits than its factorization.

8157812705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233080375.

The product of its (nonzero) digits is 156800, while the sum is 44.

The square root of 8157812705 is about 90320.6106323468. The cubic root of 8157812705 is about 2013.0655189913.

The spelling of 8157812705 in words is "eight billion, one hundred fifty-seven million, eight hundred twelve thousand, seven hundred five".