231626330640 has 60 divisors (see below), whose sum is σ = 777878429484. Its totient is φ = 61767021312.

The previous prime is 231626330629. The next prime is 231626330657. The reversal of 231626330640 is 46033626132.

231626330640 is a `hidden beast` number, since 2 + 3 + 1 + 6 + 2 + 6 + 3 + 3 + 0 + 640 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 26873700624 + 204752630016 = 163932^2 + 452496^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 231626330595 and 231626330604.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 160850899 + ... + 160852338.

Almost surely, 2^231626330640 is an apocalyptic number.

231626330640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231626330640 is an abundant number, since it is smaller than the sum of its proper divisors (546252098844).

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

231626330640 is a wasteful number, since it uses less digits than its factorization.

231626330640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321703256 (or 321703247 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 36.

Adding to 231626330640 its reverse (46033626132), we get a palindrome (277659956772).

The spelling of 231626330640 in words is "two hundred thirty-one billion, six hundred twenty-six million, three hundred thirty thousand, six hundred forty".