165226461615491 has 2 divisors, whose sum is σ = 165226461615492. Its totient is φ = 165226461615490.

The previous prime is 165226461615409. The next prime is 165226461615493. The reversal of 165226461615491 is 194516164622561.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165226461615491 is a prime.

Together with 165226461615493, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165226461615491.

It is not a weakly prime, because it can be changed into another prime (165226461615493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82613230807745 + 82613230807746.

It is an arithmetic number, because the mean of its divisors is an integer number (82613230807746).

Almost surely, 2^{165226461615491} is an apocalyptic number.

165226461615491 is a deficient number, since it is larger than the sum of its proper divisors (1).

165226461615491 is an equidigital number, since it uses as much as digits as its factorization.

165226461615491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18662400, while the sum is 59.

The spelling of 165226461615491 in words is "one hundred sixty-five trillion, two hundred twenty-six billion, four hundred sixty-one million, six hundred fifteen thousand, four hundred ninety-one".