667705652566 has 16 divisors (see below), whose sum is σ = 1028673061056. Its totient is φ = 324815429376.

The previous prime is 667705652503. The next prime is 667705652591. The reversal of 667705652566 is 665256507766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1595955 + ... + 1970401.

It is an arithmetic number, because the mean of its divisors is an integer number (64292066316).

Almost surely, 2^667705652566 is an apocalyptic number.

667705652566 is a deficient number, since it is larger than the sum of its proper divisors (360967408490).

667705652566 is a wasteful number, since it uses less digits than its factorization.

667705652566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398583.

The product of its (nonzero) digits is 95256000, while the sum is 61.

The spelling of 667705652566 in words is "six hundred sixty-seven billion, seven hundred five million, six hundred fifty-two thousand, five hundred sixty-six".