667942719569 has 16 divisors (see below), whose sum is σ = 674512018944. Its totient is φ = 661404744000.

The previous prime is 667942719557. The next prime is 667942719659. The reversal of 667942719569 is 965917249766.

It is a cyclic number.

It is not a de Polignac number, because 667942719569 - 2²⁴ = 667925942353 is a prime.

It is a super-2 number, since 2×667942719569² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (667942719539) 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, 76410539 + ... + 76419279.

It is an arithmetic number, because the mean of its divisors is an integer number (42157001184).

Almost surely, 2^667942719569 is an apocalyptic number.

It is an amenable number.

667942719569 is a deficient number, since it is larger than the sum of its proper divisors (6569299375).

667942719569 is a wasteful number, since it uses less digits than its factorization.

667942719569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10448.

The product of its digits is 308629440, while the sum is 71.

The spelling of 667942719569 in words is "six hundred sixty-seven billion, nine hundred forty-two million, seven hundred nineteen thousand, five hundred sixty-nine".