165355913777 has 2 divisors, whose sum is σ = 165355913778. Its totient is φ = 165355913776.

The previous prime is 165355913683. The next prime is 165355913831. The reversal of 165355913777 is 777319553561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115083099121 + 50272814656 = 339239^2 + 224216^2 .

It is a cyclic number.

It is not a de Polignac number, because 165355913777 - 2¹² = 165355909681 is a prime.

It is not a weakly prime, because it can be changed into another prime (165355913477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82677956888 + 82677956889.

It is an arithmetic number, because the mean of its divisors is an integer number (82677956889).

Almost surely, 2^165355913777 is an apocalyptic number.

It is an amenable number.

165355913777 is a deficient number, since it is larger than the sum of its proper divisors (1).

165355913777 is an equidigital number, since it uses as much as digits as its factorization.

165355913777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20837250, while the sum is 59.

The spelling of 165355913777 in words is "one hundred sixty-five billion, three hundred fifty-five million, nine hundred thirteen thousand, seven hundred seventy-seven".