321161531456651 has 4 divisors (see below), whose sum is σ = 321498532015272. Its totient is φ = 320824530898032.

The previous prime is 321161531456621. The next prime is 321161531456693. The reversal of 321161531456651 is 156654135161123.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321161531456651 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 321161531456651.

It is not an unprimeable number, because it can be changed into a prime (321161531456621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168500277881 + ... + 168500279786.

It is an arithmetic number, because the mean of its divisors is an integer number (80374633003818).

Almost surely, 2^{321161531456651} is an apocalyptic number.

321161531456651 is a deficient number, since it is larger than the sum of its proper divisors (337000558621).

321161531456651 is an equidigital number, since it uses as much as digits as its factorization.

321161531456651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337000558620.

The product of its digits is 1944000, while the sum is 50.

The spelling of 321161531456651 in words is "three hundred twenty-one trillion, one hundred sixty-one billion, five hundred thirty-one million, four hundred fifty-six thousand, six hundred fifty-one".