326521426036561 has 32 divisors (see below), whose sum is σ = 397765244892672. Its totient is φ = 261647920742400.

The previous prime is 326521426036517. The next prime is 326521426036591. The reversal of 326521426036561 is 165630624125623.

It is a cyclic number.

It is not a de Polignac number, because 326521426036561 - 2¹⁵ = 326521426003793 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 326521426036499 and 326521426036508.

It is not an unprimeable number, because it can be changed into a prime (326521426036591) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 238250505 + ... + 239617081.

It is an arithmetic number, because the mean of its divisors is an integer number (12430163902896).

Almost surely, 2^{326521426036561} is an apocalyptic number.

It is an amenable number.

326521426036561 is a deficient number, since it is larger than the sum of its proper divisors (71243818856111).

326521426036561 is a wasteful number, since it uses less digits than its factorization.

326521426036561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380049.

The product of its (nonzero) digits is 9331200, while the sum is 52.

The spelling of 326521426036561 in words is "three hundred twenty-six trillion, five hundred twenty-one billion, four hundred twenty-six million, thirty-six thousand, five hundred sixty-one".