666701668569 has 16 divisors (see below), whose sum is σ = 895511211840. Its totient is φ = 441180583680.

The previous prime is 666701668463. The next prime is 666701668603. The reversal of 666701668569 is 965866107666.

It is not a de Polignac number, because 666701668569 - 2²⁹ = 666164797657 is a prime.

It is a super-2 number, since 2×666701668569² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (666701668769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4471909 + ... + 4618589.

It is an arithmetic number, because the mean of its divisors is an integer number (55969450740).

Almost surely, 2^666701668569 is an apocalyptic number.

It is an amenable number.

666701668569 is a deficient number, since it is larger than the sum of its proper divisors (228809543271).

666701668569 is a wasteful number, since it uses less digits than its factorization.

666701668569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157880.

The product of its (nonzero) digits is 117573120, while the sum is 66.

The spelling of 666701668569 in words is "six hundred sixty-six billion, seven hundred one million, six hundred sixty-eight thousand, five hundred sixty-nine".