165782522897 has 4 divisors (see below), whose sum is σ = 168500269236. Its totient is φ = 163064776560.

The previous prime is 165782522891. The next prime is 165782522903. The reversal of 165782522897 is 798225287561.

It is a Cunningham number, because it is equal to 407164²+1.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (165782522891) and next prime (165782522903).

It can be written as a sum of positive squares in 2 ways, for example, as 5391083776 + 160391439121 = 73424^2 + 400489^2 .

It is a cyclic number.

It is not a de Polignac number, because 165782522897 - 2⁶ = 165782522833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165782522891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1358873078 + ... + 1358873199.

It is an arithmetic number, because the mean of its divisors is an integer number (42125067309).

Almost surely, 2^165782522897 is an apocalyptic number.

It is an amenable number.

165782522897 is a deficient number, since it is larger than the sum of its proper divisors (2717746339).

165782522897 is an equidigital number, since it uses as much as digits as its factorization.

165782522897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2717746338.

The product of its digits is 33868800, while the sum is 62.

The spelling of 165782522897 in words is "one hundred sixty-five billion, seven hundred eighty-two million, five hundred twenty-two thousand, eight hundred ninety-seven".