165572246891 has 2 divisors, whose sum is σ = 165572246892. Its totient is φ = 165572246890.

The previous prime is 165572246887. The next prime is 165572246893. The reversal of 165572246891 is 198642275561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165572246891 - 2² = 165572246887 is a prime.

Together with 165572246893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165572246893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82786123445 + 82786123446.

It is an arithmetic number, because the mean of its divisors is an integer number (82786123446).

Almost surely, 2^165572246891 is an apocalyptic number.

165572246891 is a deficient number, since it is larger than the sum of its proper divisors (1).

165572246891 is an equidigital number, since it uses as much as digits as its factorization.

165572246891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7257600, while the sum is 56.

The spelling of 165572246891 in words is "one hundred sixty-five billion, five hundred seventy-two million, two hundred forty-six thousand, eight hundred ninety-one".