165562681 has 2 divisors, whose sum is σ = 165562682. Its totient is φ = 165562680.

The previous prime is 165562669. The next prime is 165562693. The reversal of 165562681 is 186265561.

It is a balanced prime because it is at equal distance from previous prime (165562669) and next prime (165562693).

It can be written as a sum of positive squares in only one way, i.e., 120121600 + 45441081 = 10960^2 + 6741^2 .

It is a cyclic number.

It is not a de Polignac number, because 165562681 - 2¹³ = 165554489 is a prime.

It is a super-2 number, since 2×165562681² = 54822002679815522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (165562651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82781340 + 82781341.

It is an arithmetic number, because the mean of its divisors is an integer number (82781341).

Almost surely, 2^165562681 is an apocalyptic number.

It is an amenable number.

165562681 is a deficient number, since it is larger than the sum of its proper divisors (1).

165562681 is an equidigital number, since it uses as much as digits as its factorization.

165562681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86400, while the sum is 40.

The square root of 165562681 is about 12867.1162658927. The cubic root of 165562681 is about 549.1034218892.

The spelling of 165562681 in words is "one hundred sixty-five million, five hundred sixty-two thousand, six hundred eighty-one".