666512606319 has 16 divisors (see below), whose sum is σ = 1015768235520. Its totient is φ = 380815604640.

The previous prime is 666512606297. The next prime is 666512606327. The reversal of 666512606319 is 913606215666.

It is a happy number.

It is not a de Polignac number, because 666512606319 - 2⁸ = 666512606063 is a prime.

It is a super-2 number, since 2×666512606319² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666512806319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1862587 + ... + 2191404.

It is an arithmetic number, because the mean of its divisors is an integer number (63485514720).

Almost surely, 2^666512606319 is an apocalyptic number.

666512606319 is a deficient number, since it is larger than the sum of its proper divisors (349255629201).

666512606319 is a wasteful number, since it uses less digits than its factorization.

666512606319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4061830.

The product of its (nonzero) digits is 2099520, while the sum is 51.

The spelling of 666512606319 in words is "six hundred sixty-six billion, five hundred twelve million, six hundred six thousand, three hundred nineteen".