666567707715 has 192 divisors, whose sum is σ = 1437868164096. Its totient is φ = 278150132736.

The previous prime is 666567707713. The next prime is 666567707747. The reversal of 666567707715 is 517707765666.

It is a happy number.

It is not a de Polignac number, because 666567707715 - 2¹ = 666567707713 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (666567707713) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 344834889 + ... + 344836821.

It is an arithmetic number, because the mean of its divisors is an integer number (7488896688).

Almost surely, 2^666567707715 is an apocalyptic number.

666567707715 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

666567707715 is an abundant number, since it is smaller than the sum of its proper divisors (771300456381).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666567707715 is a wasteful number, since it uses less digits than its factorization.

666567707715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2858 (or 2855 counting only the distinct ones).

The product of its (nonzero) digits is 77792400, while the sum is 63.

The spelling of 666567707715 in words is "six hundred sixty-six billion, five hundred sixty-seven million, seven hundred seven thousand, seven hundred fifteen".