665411778315 has 48 divisors (see below), whose sum is σ = 1206558568800. Its totient is φ = 338798777856.

The previous prime is 665411778307. The next prime is 665411778331. The reversal of 665411778315 is 513877114566.

665411778315 is a `hidden beast` number, since 6 + 6 + 541 + 1 + 7 + 7 + 83 + 15 = 666.

It is not a de Polignac number, because 665411778315 - 2³ = 665411778307 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2748429 + ... + 2980718.

It is an arithmetic number, because the mean of its divisors is an integer number (25136636850).

Almost surely, 2^665411778315 is an apocalyptic number.

665411778315 is a deficient number, since it is larger than the sum of its proper divisors (541146790485).

665411778315 is a wasteful number, since it uses less digits than its factorization.

665411778315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5729276 (or 5729273 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 54.

The spelling of 665411778315 in words is "six hundred sixty-five billion, four hundred eleven million, seven hundred seventy-eight thousand, three hundred fifteen".