665264332121331 has 8 divisors (see below), whose sum is σ = 890316578304720. Its totient is φ = 441860820342752.

The previous prime is 665264332121321. The next prime is 665264332121399. The reversal of 665264332121331 is 133121233462566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 665264332121331 - 2¹⁴ = 665264332104947 is a prime.

It is a super-2 number, since 2×665264332121331² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (665264332121321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 412183600260 + ... + 412183601873.

It is an arithmetic number, because the mean of its divisors is an integer number (111289572288090).

Almost surely, 2^{665264332121331} is an apocalyptic number.

665264332121331 is a deficient number, since it is larger than the sum of its proper divisors (225052246183389).

665264332121331 is a wasteful number, since it uses less digits than its factorization.

665264332121331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824367202405.

The product of its digits is 2799360, while the sum is 48.

Adding to 665264332121331 its reverse (133121233462566), we get a palindrome (798385565583897).

The spelling of 665264332121331 in words is "six hundred sixty-five trillion, two hundred sixty-four billion, three hundred thirty-two million, one hundred twenty-one thousand, three hundred thirty-one".