166177987 has 2 divisors, whose sum is σ = 166177988. Its totient is φ = 166177986.

The previous prime is 166177981. The next prime is 166177993. The reversal of 166177987 is 789771661.

It is a balanced prime because it is at equal distance from previous prime (166177981) and next prime (166177993).

It is a cyclic number.

It is not a de Polignac number, because 166177987 - 2²⁷ = 31960259 is a prime.

It is not a weakly prime, because it can be changed into another prime (166177981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83088993 + 83088994.

It is an arithmetic number, because the mean of its divisors is an integer number (83088994).

Almost surely, 2^166177987 is an apocalyptic number.

166177987 is a deficient number, since it is larger than the sum of its proper divisors (1).

166177987 is an equidigital number, since it uses as much as digits as its factorization.

166177987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 889056, while the sum is 52.

The square root of 166177987 is about 12891.0041113949. The cubic root of 166177987 is about 549.7828200380.

The spelling of 166177987 in words is "one hundred sixty-six million, one hundred seventy-seven thousand, nine hundred eighty-seven".