166661500001511 has 8 divisors (see below), whose sum is σ = 222215945559280. Its totient is φ = 111107360555712.

The previous prime is 166661500001509. The next prime is 166661500001527. The reversal of 166661500001511 is 115100005166661.

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

It is not a de Polignac number, because 166661500001511 - 2¹ = 166661500001509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166661500001511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166661500001551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75254590 + ... + 77437563.

It is an arithmetic number, because the mean of its divisors is an integer number (27776993194910).

Almost surely, 2^{166661500001511} is an apocalyptic number.

166661500001511 is a deficient number, since it is larger than the sum of its proper divisors (55554445557769).

166661500001511 is a wasteful number, since it uses less digits than its factorization.

166661500001511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153055985.

The product of its (nonzero) digits is 32400, while the sum is 39.

The spelling of 166661500001511 in words is "one hundred sixty-six trillion, six hundred sixty-one billion, five hundred million, one thousand, five hundred eleven".