231621335320655 has 8 divisors (see below), whose sum is σ = 317652117011232. Its totient is φ = 158826058505568.

The previous prime is 231621335320651. The next prime is 231621335320657. The reversal of 231621335320655 is 556023533126132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231621335320655 - 2² = 231621335320651 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231621335320651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3308876218832 + ... + 3308876218901.

It is an arithmetic number, because the mean of its divisors is an integer number (39706514626404).

Almost surely, 2^{231621335320655} is an apocalyptic number.

231621335320655 is a deficient number, since it is larger than the sum of its proper divisors (86030781690577).

231621335320655 is an equidigital number, since it uses as much as digits as its factorization.

231621335320655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6617752437745.

The product of its (nonzero) digits is 2916000, while the sum is 47.

Adding to 231621335320655 its reverse (556023533126132), we get a palindrome (787644868446787).

The spelling of 231621335320655 in words is "two hundred thirty-one trillion, six hundred twenty-one billion, three hundred thirty-five million, three hundred twenty thousand, six hundred fifty-five".