166660666061695 has 16 divisors (see below), whose sum is σ = 215391817654272. Its totient is φ = 123063945062400.

The previous prime is 166660666061641. The next prime is 166660666061779. The reversal of 166660666061695 is 596160666066661.

It is not a de Polignac number, because 166660666061695 - 2¹¹ = 166660666059647 is a prime.

It is a super-2 number, since 2×166660666061695² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88085887 + ... + 89958016.

It is an arithmetic number, because the mean of its divisors is an integer number (13461988603392).

Almost surely, 2^{166660666061695} is an apocalyptic number.

166660666061695 is a deficient number, since it is larger than the sum of its proper divisors (48731151592577).

166660666061695 is a wasteful number, since it uses less digits than its factorization.

166660666061695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178058322.

The product of its (nonzero) digits is 453496320, while the sum is 70.

The spelling of 166660666061695 in words is "one hundred sixty-six trillion, six hundred sixty billion, six hundred sixty-six million, sixty-one thousand, six hundred ninety-five".