166552987 has 4 divisors (see below), whose sum is σ = 171925696. Its totient is φ = 161180280.

The previous prime is 166552973. The next prime is 166553027. The reversal of 166552987 is 789255661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166552987 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166552987.

It is not an unprimeable number, because it can be changed into a prime (166552937) 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 in 3 ways as a sum of consecutive naturals, for example, 2686308 + ... + 2686369.

It is an arithmetic number, because the mean of its divisors is an integer number (42981424).

Almost surely, 2^166552987 is an apocalyptic number.

166552987 is a deficient number, since it is larger than the sum of its proper divisors (5372709).

166552987 is an equidigital number, since it uses as much as digits as its factorization.

166552987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5372708.

The product of its digits is 907200, while the sum is 49.

The square root of 166552987 is about 12905.5409417816. The cubic root of 166552987 is about 550.1960590280.

The spelling of 166552987 in words is "one hundred sixty-six million, five hundred fifty-two thousand, nine hundred eighty-seven".