321166404250553 has 4 divisors (see below), whose sum is σ = 321167356223220. Its totient is φ = 321165452277888.

The previous prime is 321166404250547. The next prime is 321166404250633. The reversal of 321166404250553 is 355052404661123.

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

It can be written as a sum of positive squares in 2 ways, for example, as 205647158202409 + 115519246048144 = 14340403^2 + 10747988^2 .

It is a cyclic number.

It is not a de Polignac number, because 321166404250553 - 2⁴⁶ = 250797660072889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 321166404250498 and 321166404250507.

It is not an unprimeable number, because it can be changed into a prime (321166407250553) 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, 475480100 + ... + 476155077.

It is an arithmetic number, because the mean of its divisors is an integer number (80291839055805).

Almost surely, 2^{321166404250553} is an apocalyptic number.

It is an amenable number.

321166404250553 is a deficient number, since it is larger than the sum of its proper divisors (951972667).

321166404250553 is an equidigital number, since it uses as much as digits as its factorization.

321166404250553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951972666.

The product of its (nonzero) digits is 2592000, while the sum is 47.

The spelling of 321166404250553 in words is "three hundred twenty-one trillion, one hundred sixty-six billion, four hundred four million, two hundred fifty thousand, five hundred fifty-three".