8157585813 has 16 divisors (see below), whose sum is σ = 12402484416. Its totient is φ = 4724755200.

The previous prime is 8157585811. The next prime is 8157585817. The reversal of 8157585813 is 3185857518.

It is not a de Polignac number, because 8157585813 - 2¹ = 8157585811 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8157585811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6151363 + ... + 6152688.

It is an arithmetic number, because the mean of its divisors is an integer number (775155276).

Almost surely, 2^8157585813 is an apocalyptic number.

It is an amenable number.

8157585813 is a deficient number, since it is larger than the sum of its proper divisors (4244898603).

8157585813 is a wasteful number, since it uses less digits than its factorization.

8157585813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12304084.

The product of its digits is 1344000, while the sum is 51.

The square root of 8157585813 is about 90319.3545869323. The cubic root of 8157585813 is about 2013.0468557902.

The spelling of 8157585813 in words is "eight billion, one hundred fifty-seven million, five hundred eighty-five thousand, eight hundred thirteen".