667647117766 has 8 divisors (see below), whose sum is σ = 1001705831640. Its totient is φ = 333745173888.

The previous prime is 667647117757. The next prime is 667647117799. The reversal of 667647117766 is 667711746766.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×667647117766² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 667647117698 and 667647117707.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39181851 + ... + 39198886.

It is an arithmetic number, because the mean of its divisors is an integer number (125213228955).

Almost surely, 2^667647117766 is an apocalyptic number.

667647117766 is a deficient number, since it is larger than the sum of its proper divisors (334058713874).

667647117766 is a wasteful number, since it uses less digits than its factorization.

667647117766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78384998.

The product of its digits is 74680704, while the sum is 64.

The spelling of 667647117766 in words is "six hundred sixty-seven billion, six hundred forty-seven million, one hundred seventeen thousand, seven hundred sixty-six".