666489378315 has 16 divisors (see below), whose sum is σ = 1100782457856. Its totient is φ = 343994517600.

The previous prime is 666489378271. The next prime is 666489378407. The reversal of 666489378315 is 513873984666.

It is not a de Polignac number, because 666489378315 - 2¹⁵ = 666489345547 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 716654781 + ... + 716655710.

It is an arithmetic number, because the mean of its divisors is an integer number (68798903616).

Almost surely, 2^666489378315 is an apocalyptic number.

666489378315 is a deficient number, since it is larger than the sum of its proper divisors (434293079541).

666489378315 is a wasteful number, since it uses less digits than its factorization.

666489378315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1433310530.

The product of its digits is 156764160, while the sum is 66.

The spelling of 666489378315 in words is "six hundred sixty-six billion, four hundred eighty-nine million, three hundred seventy-eight thousand, three hundred fifteen".