166295604981 has 16 divisors (see below), whose sum is σ = 241891836480. Its totient is φ = 100782165120.

The previous prime is 166295604971. The next prime is 166295604983. The reversal of 166295604981 is 189406592661.

It is not a de Polignac number, because 166295604981 - 2⁹ = 166295604469 is a prime.

It is a super-2 number, since 2×166295604981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166295604983) 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, 1545585 + ... + 1649673.

It is an arithmetic number, because the mean of its divisors is an integer number (15118239780).

Almost surely, 2^166295604981 is an apocalyptic number.

166295604981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166295604981 is a deficient number, since it is larger than the sum of its proper divisors (75596231499).

166295604981 is a wasteful number, since it uses less digits than its factorization.

166295604981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152516.

The product of its (nonzero) digits is 5598720, while the sum is 57.

The spelling of 166295604981 in words is "one hundred sixty-six billion, two hundred ninety-five million, six hundred four thousand, nine hundred eighty-one".