231640636530 has 32 divisors (see below), whose sum is σ = 557154054144. Its totient is φ = 61635666816.

The previous prime is 231640636523. The next prime is 231640636537. The reversal of 231640636530 is 35636046132.

It is an interprime number because it is at equal distance from previous prime (231640636523) and next prime (231640636537).

It is not an unprimeable number, because it can be changed into a prime (231640636537) 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, 8434162 + ... + 8461581.

It is an arithmetic number, because the mean of its divisors is an integer number (17411064192).

Almost surely, 2^231640636530 is an apocalyptic number.

231640636530 is an abundant number, since it is smaller than the sum of its proper divisors (325513417614).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231640636530 is a wasteful number, since it uses less digits than its factorization.

231640636530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16896210.

The product of its (nonzero) digits is 233280, while the sum is 39.

The spelling of 231640636530 in words is "two hundred thirty-one billion, six hundred forty million, six hundred thirty-six thousand, five hundred thirty".