166126613661 has 32 divisors (see below), whose sum is σ = 247124640000. Its totient is φ = 110296862784.

The previous prime is 166126613623. The next prime is 166126613683. The reversal of 166126613661 is 166316621661.

166126613661 is a `hidden beast` number, since 1 + 6 + 6 + 1 + 26 + 613 + 6 + 6 + 1 = 666.

It is not a de Polignac number, because 166126613661 - 2⁷ = 166126613533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166127613661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7895391 + ... + 7916403.

It is an arithmetic number, because the mean of its divisors is an integer number (7722645000).

Almost surely, 2^166126613661 is an apocalyptic number.

It is an amenable number.

166126613661 is a deficient number, since it is larger than the sum of its proper divisors (80998026339).

166126613661 is a wasteful number, since it uses less digits than its factorization.

166126613661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22210 (or 22204 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The spelling of 166126613661 in words is "one hundred sixty-six billion, one hundred twenty-six million, six hundred thirteen thousand, six hundred sixty-one".