166582987 has 2 divisors, whose sum is σ = 166582988. Its totient is φ = 166582986.

The previous prime is 166582973. The next prime is 166583029. The reversal of 166582987 is 789285661.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166582987 is a prime.

It is not a weakly prime, because it can be changed into another prime (166582907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83291493 + 83291494.

It is an arithmetic number, because the mean of its divisors is an integer number (83291494).

Almost surely, 2^166582987 is an apocalyptic number.

166582987 is a deficient number, since it is larger than the sum of its proper divisors (1).

166582987 is an equidigital number, since it uses as much as digits as its factorization.

166582987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 52.

The square root of 166582987 is about 12906.7031809056. The cubic root of 166582987 is about 550.2290913403.

The spelling of 166582987 in words is "one hundred sixty-six million, five hundred eighty-two thousand, nine hundred eighty-seven".