166666609018516 has 6 divisors (see below), whose sum is σ = 291666565782410. Its totient is φ = 83333304509256.

The previous prime is 166666609018463. The next prime is 166666609018561. The reversal of 166666609018516 is 615810906666661.

It can be written as a sum of positive squares in only one way, i.e., 86975208602500 + 79691400416016 = 9326050^2 + 8927004^2 .

It is a super-3 number, since 3×166666609018516³ (a number of 44 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20833326127311 + ... + 20833326127318.

Almost surely, 2^{166666609018516} is an apocalyptic number.

It is an amenable number.

166666609018516 is a deficient number, since it is larger than the sum of its proper divisors (124999956763894).

166666609018516 is a wasteful number, since it uses less digits than its factorization.

166666609018516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41666652254633 (or 41666652254631 counting only the distinct ones).

The product of its (nonzero) digits is 100776960, while the sum is 67.

The spelling of 166666609018516 in words is "one hundred sixty-six trillion, six hundred sixty-six billion, six hundred nine million, eighteen thousand, five hundred sixteen".