166636426 has 16 divisors (see below), whose sum is σ = 284534208. Its totient is φ = 72450400.

The previous prime is 166636417. The next prime is 166636427. The reversal of 166636426 is 624636661.

It is not an unprimeable number, because it can be changed into a prime (166636427) 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, 164155 + ... + 165166.

It is an arithmetic number, because the mean of its divisors is an integer number (17783388).

Almost surely, 2^166636426 is an apocalyptic number.

166636426 is a deficient number, since it is larger than the sum of its proper divisors (117897782).

166636426 is a wasteful number, since it uses less digits than its factorization.

166636426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329357.

The product of its digits is 186624, while the sum is 40.

The square root of 166636426 is about 12908.7732182419. The cubic root of 166636426 is about 550.2879219754.

The spelling of 166636426 in words is "one hundred sixty-six million, six hundred thirty-six thousand, four hundred twenty-six".