166557042612 has 24 divisors (see below), whose sum is σ = 431814555200. Its totient is φ = 55519014168.

The previous prime is 166557042611. The next prime is 166557042623. The reversal of 166557042612 is 216240755661.

166557042612 is a `hidden beast` number, since 1 + 6 + 65 + 570 + 4 + 2 + 6 + 12 = 666.

166557042612 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166557042611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 771097312 + ... + 771097527.

Almost surely, 2^166557042612 is an apocalyptic number.

166557042612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

166557042612 is an abundant number, since it is smaller than the sum of its proper divisors (265257512588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166557042612 is a wasteful number, since it uses less digits than its factorization.

166557042612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1542194852 (or 1542194844 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 166557042612 in words is "one hundred sixty-six billion, five hundred fifty-seven million, forty-two thousand, six hundred twelve".