231563720403 has 56 divisors (see below), whose sum is σ = 351485925696. Its totient is φ = 152471808000.

The previous prime is 231563720393. The next prime is 231563720411. The reversal of 231563720403 is 304027365132.

231563720403 is a `hidden beast` number, since 2 + 3 + 15 + 637 + 2 + 0 + 4 + 0 + 3 = 666.

It is not a de Polignac number, because 231563720403 - 2⁵ = 231563720371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231563720413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 31730451 + ... + 31737747.

Almost surely, 2^231563720403 is an apocalyptic number.

231563720403 is a deficient number, since it is larger than the sum of its proper divisors (119922205293).

231563720403 is an equidigital number, since it uses as much as digits as its factorization.

231563720403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7847 (or 7832 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 36.

The spelling of 231563720403 in words is "two hundred thirty-one billion, five hundred sixty-three million, seven hundred twenty thousand, four hundred three".