665350634331 has 6 divisors (see below), whose sum is σ = 961062027380. Its totient is φ = 443567089548.

The previous prime is 665350634261. The next prime is 665350634363. The reversal of 665350634331 is 133436053566.

665350634331 is a `hidden beast` number, since 6 + 6 + 5 + 3 + 5 + 0 + 634 + 3 + 3 + 1 = 666.

It is not a de Polignac number, because 665350634331 - 2¹⁸ = 665350372187 is a prime.

It is a super-2 number, since 2×665350634331² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665350633331) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 36963924121 + ... + 36963924138.

Almost surely, 2^665350634331 is an apocalyptic number.

665350634331 is a deficient number, since it is larger than the sum of its proper divisors (295711393049).

665350634331 is a wasteful number, since it uses less digits than its factorization.

665350634331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73927848265 (or 73927848262 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 45.

Adding to 665350634331 its reverse (133436053566), we get a palindrome (798786687897).

The spelling of 665350634331 in words is "six hundred sixty-five billion, three hundred fifty million, six hundred thirty-four thousand, three hundred thirty-one".