166421624154123 has 64 divisors (see below), whose sum is σ = 253311242204160. Its totient is φ = 96342892743168.

The previous prime is 166421624154113. The next prime is 166421624154151. The reversal of 166421624154123 is 321451426124661.

It is not a de Polignac number, because 166421624154123 - 2³⁰ = 166420550412299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166421624154103) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 58756690 + ... + 61523912.

It is an arithmetic number, because the mean of its divisors is an integer number (3957988159440).

Almost surely, 2^{166421624154123} is an apocalyptic number.

166421624154123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

166421624154123 is a deficient number, since it is larger than the sum of its proper divisors (86889618050037).

166421624154123 is a wasteful number, since it uses less digits than its factorization.

166421624154123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2767828.

The product of its digits is 1658880, while the sum is 48.

The spelling of 166421624154123 in words is "one hundred sixty-six trillion, four hundred twenty-one billion, six hundred twenty-four million, one hundred fifty-four thousand, one hundred twenty-three".