166759424957661 has 16 divisors (see below), whose sum is σ = 222459882208128. Its totient is φ = 111115960704000.

The previous prime is 166759424957603. The next prime is 166759424957669.

166759424957661 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 166759424957661 - 2¹⁵ = 166759424924893 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166759424957669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 422834361 + ... + 423228561.

It is an arithmetic number, because the mean of its divisors is an integer number (13903742638008).

Almost surely, 2^{166759424957661} is an apocalyptic number.

It is an amenable number.

166759424957661 is a deficient number, since it is larger than the sum of its proper divisors (55700457250467).

166759424957661 is a wasteful number, since it uses less digits than its factorization.

166759424957661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466132.

The product of its digits is 4115059200, while the sum is 78.

The spelling of 166759424957661 in words is "one hundred sixty-six trillion, seven hundred fifty-nine billion, four hundred twenty-four million, nine hundred fifty-seven thousand, six hundred sixty-one".