165998246399 has 2 divisors, whose sum is σ = 165998246400. Its totient is φ = 165998246398.

The previous prime is 165998246383. The next prime is 165998246411. The reversal of 165998246399 is 993642899561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165998246399 - 2⁴ = 165998246383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165998246339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82999123199 + 82999123200.

It is an arithmetic number, because the mean of its divisors is an integer number (82999123200).

Almost surely, 2^165998246399 is an apocalyptic number.

165998246399 is a deficient number, since it is larger than the sum of its proper divisors (1).

165998246399 is an equidigital number, since it uses as much as digits as its factorization.

165998246399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226748160, while the sum is 71.

The spelling of 165998246399 in words is "one hundred sixty-five billion, nine hundred ninety-eight million, two hundred forty-six thousand, three hundred ninety-nine".