165690047 has 2 divisors, whose sum is σ = 165690048. Its totient is φ = 165690046.

The previous prime is 165690037. The next prime is 165690059. The reversal of 165690047 is 740096561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165690047 - 2⁸ = 165689791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165690037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82845023 + 82845024.

It is an arithmetic number, because the mean of its divisors is an integer number (82845024).

Almost surely, 2^165690047 is an apocalyptic number.

165690047 is a deficient number, since it is larger than the sum of its proper divisors (1).

165690047 is an equidigital number, since it uses as much as digits as its factorization.

165690047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 165690047 is about 12872.0645974140. The cubic root of 165690047 is about 549.2441927031.

The spelling of 165690047 in words is "one hundred sixty-five million, six hundred ninety thousand, forty-seven".