166733987 has 12 divisors (see below), whose sum is σ = 201113136. Its totient is φ = 135390960.

The previous prime is 166733981. The next prime is 166733999. The reversal of 166733987 is 789337661.

It is not a de Polignac number, because 166733987 - 2¹⁰ = 166732963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166733981) 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, 30464 + ... + 35517.

It is an arithmetic number, because the mean of its divisors is an integer number (16759428).

Almost surely, 2^166733987 is an apocalyptic number.

166733987 is a deficient number, since it is larger than the sum of its proper divisors (34379149).

166733987 is an equidigital number, since it uses as much as digits as its factorization.

166733987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66026 (or 66007 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 50.

The square root of 166733987 is about 12912.5515294228. The cubic root of 166733987 is about 550.3952937894.

The spelling of 166733987 in words is "one hundred sixty-six million, seven hundred thirty-three thousand, nine hundred eighty-seven".