166661500001572 has 6 divisors (see below), whose sum is σ = 291657625002758. Its totient is φ = 83330750000784.

The previous prime is 166661500001551. The next prime is 166661500001681. The reversal of 166661500001572 is 275100005166661.

166661500001572 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 133332654744576 + 33328845256996 = 11546976^2 + 5773114^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20832687500193 + ... + 20832687500200.

Almost surely, 2^{166661500001572} is an apocalyptic number.

It is an amenable number.

166661500001572 is a deficient number, since it is larger than the sum of its proper divisors (124996125001186).

166661500001572 is a wasteful number, since it uses less digits than its factorization.

166661500001572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41665375000397 (or 41665375000395 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 46.

The spelling of 166661500001572 in words is "one hundred sixty-six trillion, six hundred sixty-one billion, five hundred million, one thousand, five hundred seventy-two".