666771107667 has 16 divisors (see below), whose sum is σ = 1069507541760. Its totient is φ = 360958794912.

The previous prime is 666771107579. The next prime is 666771107687. The reversal of 666771107667 is 766701177666.

It is not a de Polignac number, because 666771107667 - 2⁸ = 666771107411 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666771107667.

It is not an unprimeable number, because it can be changed into a prime (666771107687) 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, 835552368 + ... + 835553165.

It is an arithmetic number, because the mean of its divisors is an integer number (66844221360).

Almost surely, 2^666771107667 is an apocalyptic number.

666771107667 is a deficient number, since it is larger than the sum of its proper divisors (402736434093).

666771107667 is a wasteful number, since it uses less digits than its factorization.

666771107667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671105562.

The product of its (nonzero) digits is 18670176, while the sum is 60.

The spelling of 666771107667 in words is "six hundred sixty-six billion, seven hundred seventy-one million, one hundred seven thousand, six hundred sixty-seven".