231664313220 has 48 divisors (see below), whose sum is σ = 648702212928. Its totient is φ = 61773137280.

The previous prime is 231664313207. The next prime is 231664313269. The reversal of 231664313220 is 22313466132.

It is a happy number.

231664313220 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 871455 + ... + 1105785.

It is an arithmetic number, because the mean of its divisors is an integer number (13514629436).

Almost surely, 2^231664313220 is an apocalyptic number.

231664313220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231664313220 is an abundant number, since it is smaller than the sum of its proper divisors (417037899708).

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

231664313220 is a wasteful number, since it uses less digits than its factorization.

231664313220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250820 (or 250818 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 33.

Adding to 231664313220 its reverse (22313466132), we get a palindrome (253977779352).

The spelling of 231664313220 in words is "two hundred thirty-one billion, six hundred sixty-four million, three hundred thirteen thousand, two hundred twenty".