165782522891 has 2 divisors, whose sum is σ = 165782522892. Its totient is φ = 165782522890.

The previous prime is 165782522863. The next prime is 165782522903. The reversal of 165782522891 is 198225287561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165782522891 - 2¹⁴ = 165782506507 is a prime.

It is a super-2 number, since 2×165782522891² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (165782522861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82891261445 + 82891261446.

It is an arithmetic number, because the mean of its divisors is an integer number (82891261446).

Almost surely, 2^165782522891 is an apocalyptic number.

165782522891 is a deficient number, since it is larger than the sum of its proper divisors (1).

165782522891 is an equidigital number, since it uses as much as digits as its factorization.

165782522891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4838400, while the sum is 56.

The spelling of 165782522891 in words is "one hundred sixty-five billion, seven hundred eighty-two million, five hundred twenty-two thousand, eight hundred ninety-one".