667145686761 has 12 divisors (see below), whose sum is σ = 1005552919488. Its totient is φ = 425426234904.

The previous prime is 667145686747. The next prime is 667145686783. The reversal of 667145686761 is 167686541766.

667145686761 is a `hidden beast` number, since 6 + 6 + 7 + 1 + 4 + 568 + 6 + 7 + 61 = 666.

It is not a de Polignac number, because 667145686761 - 2¹⁰ = 667145685737 is a prime.

It is a super-2 number, since 2×667145686761² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (667145636761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1611462805 + ... + 1611463218.

It is an arithmetic number, because the mean of its divisors is an integer number (83796076624).

Almost surely, 2^667145686761 is an apocalyptic number.

It is an amenable number.

667145686761 is a deficient number, since it is larger than the sum of its proper divisors (338407232727).

667145686761 is a wasteful number, since it uses less digits than its factorization.

667145686761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3222926052 (or 3222926049 counting only the distinct ones).

The product of its digits is 60963840, while the sum is 63.

The spelling of 667145686761 in words is "six hundred sixty-seven billion, one hundred forty-five million, six hundred eighty-six thousand, seven hundred sixty-one".