667418564181 has 16 divisors (see below), whose sum is σ = 894079105920. Its totient is φ = 442853441280.

The previous prime is 667418564177. The next prime is 667418564213. The reversal of 667418564181 is 181465814766.

It is not a de Polignac number, because 667418564181 - 2² = 667418564177 is a prime.

It is a super-2 number, since 2×667418564181² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667418564101) 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, 1510680 + ... + 1901838.

It is an arithmetic number, because the mean of its divisors is an integer number (55879944120).

Almost surely, 2^667418564181 is an apocalyptic number.

It is an amenable number.

667418564181 is a deficient number, since it is larger than the sum of its proper divisors (226660541739).

667418564181 is a wasteful number, since it uses less digits than its factorization.

667418564181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393836.

The product of its digits is 7741440, while the sum is 57.

The spelling of 667418564181 in words is "six hundred sixty-seven billion, four hundred eighteen million, five hundred sixty-four thousand, one hundred eighty-one".