166989650 has 24 divisors (see below), whose sum is σ = 311377764. Its totient is φ = 66628800.

The previous prime is 166989649. The next prime is 166989659. The reversal of 166989650 is 56989661.

166989650 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 5013121 + 161976529 = 2239^2 + 12727^2 .

It is a Harshad number since it is a multiple of its sum of digits (50).

It is not an unprimeable number, because it can be changed into a prime (166989659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17084 + ... + 25016.

Almost surely, 2^166989650 is an apocalyptic number.

166989650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166989650 is a deficient number, since it is larger than the sum of its proper divisors (144388114).

166989650 is a wasteful number, since it uses less digits than its factorization.

166989650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8366 (or 8361 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 50.

The square root of 166989650 is about 12922.4475235924. The cubic root of 166989650 is about 550.6764679183.

It can be divided in two parts, 1669 and 89650, that added together give a palindrome (91319).

The spelling of 166989650 in words is "one hundred sixty-six million, nine hundred eighty-nine thousand, six hundred fifty".