165261377 has 2 divisors, whose sum is σ = 165261378. Its totient is φ = 165261376.

The previous prime is 165261361. The next prime is 165261389. The reversal of 165261377 is 773162561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115756081 + 49505296 = 10759^2 + 7036^2 .

It is a cyclic number.

It is not a de Polignac number, because 165261377 - 2⁴ = 165261361 is a prime.

It is a super-2 number, since 2×165261377² = 54622645455872258, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165261377.

It is not a weakly prime, because it can be changed into another prime (165261307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82630688 + 82630689.

It is an arithmetic number, because the mean of its divisors is an integer number (82630689).

Almost surely, 2^165261377 is an apocalyptic number.

It is an amenable number.

165261377 is a deficient number, since it is larger than the sum of its proper divisors (1).

165261377 is an equidigital number, since it uses as much as digits as its factorization.

165261377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 38.

The square root of 165261377 is about 12855.4026385796. The cubic root of 165261377 is about 548.7701190729.

The spelling of 165261377 in words is "one hundred sixty-five million, two hundred sixty-one thousand, three hundred seventy-seven".