166681836 has 18 divisors (see below), whose sum is σ = 421334732. Its totient is φ = 55560600.

The previous prime is 166681831. The next prime is 166681843. The reversal of 166681836 is 638186661.

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 166681791 and 166681800.

It is not an unprimeable number, because it can be changed into a prime (166681831) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2314990 + ... + 2315061.

Almost surely, 2^166681836 is an apocalyptic number.

It is an amenable number.

166681836 is an abundant number, since it is smaller than the sum of its proper divisors (254652896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166681836 is a wasteful number, since it uses less digits than its factorization.

166681836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4630061 (or 4630056 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 166681836 is about 12910.5319797443. The cubic root of 166681836 is about 550.3379036543.

The spelling of 166681836 in words is "one hundred sixty-six million, six hundred eighty-one thousand, eight hundred thirty-six".