165266623663 has 2 divisors, whose sum is σ = 165266623664. Its totient is φ = 165266623662.

The previous prime is 165266623661. The next prime is 165266623673. The reversal of 165266623663 is 366326662561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165266623663 - 2¹ = 165266623661 is a prime.

Together with 165266623661, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 165266623663.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165266623661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82633311831 + 82633311832.

It is an arithmetic number, because the mean of its divisors is an integer number (82633311832).

Almost surely, 2^165266623663 is an apocalyptic number.

165266623663 is a deficient number, since it is larger than the sum of its proper divisors (1).

165266623663 is an equidigital number, since it uses as much as digits as its factorization.

165266623663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8398080, while the sum is 52.

The spelling of 165266623663 in words is "one hundred sixty-five billion, two hundred sixty-six million, six hundred twenty-three thousand, six hundred sixty-three".