166687636 has 6 divisors (see below), whose sum is σ = 291703370. Its totient is φ = 83343816.

The previous prime is 166687583. The next prime is 166687637. The reversal of 166687636 is 636786661.

It can be written as a sum of positive squares in only one way, i.e., 122544900 + 44142736 = 11070^2 + 6644^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 166687636.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166687637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20835951 + ... + 20835958.

Almost surely, 2^166687636 is an apocalyptic number.

It is an amenable number.

166687636 is a deficient number, since it is larger than the sum of its proper divisors (125015734).

166687636 is a wasteful number, since it uses less digits than its factorization.

166687636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41671913 (or 41671911 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 49.

The square root of 166687636 is about 12910.7566006025. The cubic root of 166687636 is about 550.3442869189.

The spelling of 166687636 in words is "one hundred sixty-six million, six hundred eighty-seven thousand, six hundred thirty-six".