166258917957 has 8 divisors (see below), whose sum is σ = 241831153440. Its totient is φ = 100762980560.

The previous prime is 166258917901. The next prime is 166258918037. The reversal of 166258917957 is 759719852661.

166258917957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 166258917957 - 2¹⁶ = 166258852421 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166258917157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2519074482 + ... + 2519074547.

It is an arithmetic number, because the mean of its divisors is an integer number (30228894180).

Almost surely, 2^166258917957 is an apocalyptic number.

It is an amenable number.

166258917957 is a deficient number, since it is larger than the sum of its proper divisors (75572235483).

166258917957 is a wasteful number, since it uses less digits than its factorization.

166258917957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5038149043.

The product of its digits is 57153600, while the sum is 66.

The spelling of 166258917957 in words is "one hundred sixty-six billion, two hundred fifty-eight million, nine hundred seventeen thousand, nine hundred fifty-seven".