166436638 has 16 divisors (see below), whose sum is σ = 254524896. Its totient is φ = 81607680.

The previous prime is 166436629. The next prime is 166436659. The reversal of 166436638 is 836634661.

It is a junction number, because it is equal to n+sod(n) for n = 166436594 and 166436603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24370 + ... + 30442.

It is an arithmetic number, because the mean of its divisors is an integer number (15907806).

Almost surely, 2^166436638 is an apocalyptic number.

166436638 is a deficient number, since it is larger than the sum of its proper divisors (88088258).

166436638 is a wasteful number, since it uses less digits than its factorization.

166436638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6339.

The product of its digits is 373248, while the sum is 43.

The square root of 166436638 is about 12901.0324393050. The cubic root of 166436638 is about 550.0679122752.

The spelling of 166436638 in words is "one hundred sixty-six million, four hundred thirty-six thousand, six hundred thirty-eight".