665131564415 has 8 divisors (see below), whose sum is σ = 805617297360. Its totient is φ = 527132304832.

The previous prime is 665131564399. The next prime is 665131564421. The reversal of 665131564415 is 514465131566.

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 665131564415 - 2⁴ = 665131564399 is a prime.

It is a super-2 number, since 2×665131564415² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 665131564415.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 621617750 + ... + 621618819.

It is an arithmetic number, because the mean of its divisors is an integer number (100702162170).

Almost surely, 2^665131564415 is an apocalyptic number.

665131564415 is a deficient number, since it is larger than the sum of its proper divisors (140485732945).

665131564415 is a wasteful number, since it uses less digits than its factorization.

665131564415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243236681.

The product of its digits is 1296000, while the sum is 47.

The spelling of 665131564415 in words is "six hundred sixty-five billion, one hundred thirty-one million, five hundred sixty-four thousand, four hundred fifteen".