165565156439 has 2 divisors, whose sum is σ = 165565156440. Its totient is φ = 165565156438.

The previous prime is 165565156429. The next prime is 165565156447. The reversal of 165565156439 is 934651565561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165565156439 - 2¹² = 165565152343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165565156429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82782578219 + 82782578220.

It is an arithmetic number, because the mean of its divisors is an integer number (82782578220).

Almost surely, 2^165565156439 is an apocalyptic number.

165565156439 is a deficient number, since it is larger than the sum of its proper divisors (1).

165565156439 is an equidigital number, since it uses as much as digits as its factorization.

165565156439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14580000, while the sum is 56.

The spelling of 165565156439 in words is "one hundred sixty-five billion, five hundred sixty-five million, one hundred fifty-six thousand, four hundred thirty-nine".