665279415 has 12 divisors (see below), whose sum is σ = 1153151064. Its totient is φ = 354815664.

The previous prime is 665279399. The next prime is 665279423. The reversal of 665279415 is 514972566.

It is not a de Polignac number, because 665279415 - 2⁴ = 665279399 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 14783987 = 665279415 / (6 + 6 + 5 + 2 + 7 + 9 + 4 + 1 + 5).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7391949 + ... + 7392038.

It is an arithmetic number, because the mean of its divisors is an integer number (96095922).

Almost surely, 2^665279415 is an apocalyptic number.

665279415 is a deficient number, since it is larger than the sum of its proper divisors (487871649).

665279415 is a wasteful number, since it uses less digits than its factorization.

665279415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14783998 (or 14783995 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 665279415 is about 25793.0109719668. The cubic root of 665279415 is about 872.9741059777.

The spelling of 665279415 in words is "six hundred sixty-five million, two hundred seventy-nine thousand, four hundred fifteen".