809138215625 has 96 divisors (see below), whose sum is σ = 1140002035200. Its totient is φ = 570620160000.

The previous prime is 809138215619. The next prime is 809138215631. The reversal of 809138215625 is 526512831908.

809138215625 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (809138215619) and next prime (809138215631).

It is not a de Polignac number, because 809138215625 - 2¹⁶ = 809138150089 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 89829872 + ... + 89838878.

It is an arithmetic number, because the mean of its divisors is an integer number (11875021200).

Almost surely, 2^809138215625 is an apocalyptic number.

809138215625 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

809138215625 is a deficient number, since it is larger than the sum of its proper divisors (330863819575).

809138215625 is an equidigital number, since it uses as much as digits as its factorization.

809138215625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9157 (or 9137 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 50.

The spelling of 809138215625 in words is "eight hundred nine billion, one hundred thirty-eight million, two hundred fifteen thousand, six hundred twenty-five".