331564775405 has 4 divisors (see below), whose sum is σ = 397877730492. Its totient is φ = 265251820320.

The previous prime is 331564775317. The next prime is 331564775431. The reversal of 331564775405 is 504577465133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 504577465133 = 7 ⋅72082495019.

It can be written as a sum of positive squares in 2 ways, for example, as 245653061956 + 85911713449 = 495634^2 + 293107^2 .

It is not a de Polignac number, because 331564775405 - 2¹⁸ = 331564513261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33156477536 + ... + 33156477545.

It is an arithmetic number, because the mean of its divisors is an integer number (99469432623).

Almost surely, 2^331564775405 is an apocalyptic number.

It is an amenable number.

331564775405 is a deficient number, since it is larger than the sum of its proper divisors (66312955087).

331564775405 is an equidigital number, since it uses as much as digits as its factorization.

331564775405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66312955086.

The product of its (nonzero) digits is 5292000, while the sum is 50.

The spelling of 331564775405 in words is "three hundred thirty-one billion, five hundred sixty-four million, seven hundred seventy-five thousand, four hundred five".