326405399761 has 27 divisors (see below), whose sum is σ = 403428998097. Its totient is φ = 263263795200.

The previous prime is 326405399741. The next prime is 326405399791. The reversal of 326405399761 is 167993504623.

The square root of 326405399761 is 571319.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 43440980625 + 282964419136 = 208425^2 + 531944^2 .

It is not a de Polignac number, because 326405399761 - 2⁷ = 326405399633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (326405399701) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 67984561 + ... + 67989361.

Almost surely, 2^326405399761 is an apocalyptic number.

326405399761 is the 571319-th square number.

326405399761 is the 285660-th centered octagonal number.

It is an amenable number.

326405399761 is a deficient number, since it is larger than the sum of its proper divisors (77023598336).

326405399761 is an frugal number, since it uses more digits than its factorization.

326405399761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9650 (or 4825 counting only the distinct ones).

The product of its (nonzero) digits is 7348320, while the sum is 55.

The spelling of 326405399761 in words is "three hundred twenty-six billion, four hundred five million, three hundred ninety-nine thousand, seven hundred sixty-one".