401233255565521 has 4 divisors (see below), whose sum is σ = 401281428614500. Its totient is φ = 401185082516544.

The previous prime is 401233255565501. The next prime is 401233255565551. The reversal of 401233255565521 is 125565552332104.

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 93544469641921 + 307688785923600 = 9671839^2 + 17541060^2 .

It is a cyclic number.

It is not a de Polignac number, because 401233255565521 - 2⁵ = 401233255565489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (401233255565501) 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, 24086511996 + ... + 24086528653.

It is an arithmetic number, because the mean of its divisors is an integer number (100320357153625).

Almost surely, 2^{401233255565521} is an apocalyptic number.

It is an amenable number.

401233255565521 is a deficient number, since it is larger than the sum of its proper divisors (48173048979).

401233255565521 is an equidigital number, since it uses as much as digits as its factorization.

401233255565521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48173048978.

The product of its (nonzero) digits is 5400000, while the sum is 49.

The spelling of 401233255565521 in words is "four hundred one trillion, two hundred thirty-three billion, two hundred fifty-five million, five hundred sixty-five thousand, five hundred twenty-one".