666169613799 has 16 divisors (see below), whose sum is σ = 935002656000. Its totient is φ = 420726211776.

The previous prime is 666169613783. The next prime is 666169613827. The reversal of 666169613799 is 997316961666.

It is not a de Polignac number, because 666169613799 - 2⁴ = 666169613783 is a prime.

It is a super-2 number, since 2×666169613799² (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 (666169613729) 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, 1999947 + ... + 2309139.

It is an arithmetic number, because the mean of its divisors is an integer number (58437666000).

Almost surely, 2^666169613799 is an apocalyptic number.

666169613799 is a deficient number, since it is larger than the sum of its proper divisors (268833042201).

666169613799 is a wasteful number, since it uses less digits than its factorization.

666169613799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347014.

The product of its digits is 119042784, while the sum is 69.

The spelling of 666169613799 in words is "six hundred sixty-six billion, one hundred sixty-nine million, six hundred thirteen thousand, seven hundred ninety-nine".