165994487 has 2 divisors, whose sum is σ = 165994488. Its totient is φ = 165994486.

The previous prime is 165994483. The next prime is 165994513. The reversal of 165994487 is 784499561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165994487 - 2² = 165994483 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165994483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82997243 + 82997244.

It is an arithmetic number, because the mean of its divisors is an integer number (82997244).

Almost surely, 2^165994487 is an apocalyptic number.

165994487 is a deficient number, since it is larger than the sum of its proper divisors (1).

165994487 is an equidigital number, since it uses as much as digits as its factorization.

165994487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 53.

The square root of 165994487 is about 12883.8847790564. The cubic root of 165994487 is about 549.5803818655.

The spelling of 165994487 in words is "one hundred sixty-five million, nine hundred ninety-four thousand, four hundred eighty-seven".