231501533660 has 24 divisors (see below), whose sum is σ = 486194074800. Its totient is φ = 92592831744.

The previous prime is 231501533647. The next prime is 231501533677. The reversal of 231501533660 is 66335105132.

231501533660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×231501533660² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 231501533660.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239354 + ... + 721313.

It is an arithmetic number, because the mean of its divisors is an integer number (20258086450).

Almost surely, 2^231501533660 is an apocalyptic number.

231501533660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231501533660 is an abundant number, since it is smaller than the sum of its proper divisors (254692541140).

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

231501533660 is a wasteful number, since it uses less digits than its factorization.

231501533660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972725 (or 972723 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 35.

Adding to 231501533660 its reverse (66335105132), we get a palindrome (297836638792).

The spelling of 231501533660 in words is "two hundred thirty-one billion, five hundred one million, five hundred thirty-three thousand, six hundred sixty".