165065840777 has 2 divisors, whose sum is σ = 165065840778. Its totient is φ = 165065840776.

The previous prime is 165065840761. The next prime is 165065840783. The reversal of 165065840777 is 777048560561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98282877001 + 66782963776 = 313501^2 + 258424^2 .

It is a cyclic number.

It is not a de Polignac number, because 165065840777 - 2⁴ = 165065840761 is a prime.

It is not a weakly prime, because it can be changed into another prime (165065840707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82532920388 + 82532920389.

It is an arithmetic number, because the mean of its divisors is an integer number (82532920389).

Almost surely, 2^165065840777 is an apocalyptic number.

It is an amenable number.

165065840777 is a deficient number, since it is larger than the sum of its proper divisors (1).

165065840777 is an equidigital number, since it uses as much as digits as its factorization.

165065840777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9878400, while the sum is 56.

The spelling of 165065840777 in words is "one hundred sixty-five billion, sixty-five million, eight hundred forty thousand, seven hundred seventy-seven".