166154064399 has 32 divisors (see below), whose sum is σ = 254617006080. Its totient is φ = 106975792800.

The previous prime is 166154064367. The next prime is 166154064409. The reversal of 166154064399 is 993460451661.

It is a happy number.

166154064399 is a `hidden beast` number, since 1 + 6 + 6 + 1 + 540 + 6 + 4 + 3 + 99 = 666.

It is a Cunningham number, because it is equal to 407620²-1.

It is not a de Polignac number, because 166154064399 - 2⁵ = 166154064367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166154064299) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 203809 + ... + 611429.

It is an arithmetic number, because the mean of its divisors is an integer number (7956781440).

Almost surely, 2^166154064399 is an apocalyptic number.

166154064399 is a deficient number, since it is larger than the sum of its proper divisors (88462941681).

166154064399 is a wasteful number, since it uses less digits than its factorization.

166154064399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408148 (or 408142 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 54.

The spelling of 166154064399 in words is "one hundred sixty-six billion, one hundred fifty-four million, sixty-four thousand, three hundred ninety-nine".