166138777144 has 16 divisors (see below), whose sum is σ = 311538510720. Its totient is φ = 83061840960.

The previous prime is 166138777141. The next prime is 166138777163. The reversal of 166138777144 is 441777831661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166138777141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 849349 + ... + 1026484.

It is an arithmetic number, because the mean of its divisors is an integer number (19471156920).

Almost surely, 2^166138777144 is an apocalyptic number.

It is an amenable number.

166138777144 is a deficient number, since it is larger than the sum of its proper divisors (145399733576).

166138777144 is a wasteful number, since it uses less digits than its factorization.

166138777144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1886910 (or 1886906 counting only the distinct ones).

The product of its digits is 4741632, while the sum is 55.

The spelling of 166138777144 in words is "one hundred sixty-six billion, one hundred thirty-eight million, seven hundred seventy-seven thousand, one hundred forty-four".