165601210547 has 2 divisors, whose sum is σ = 165601210548. Its totient is φ = 165601210546.

The previous prime is 165601210519. The next prime is 165601210571. The reversal of 165601210547 is 745012106561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165601210547 - 2³⁰ = 164527468723 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165601210547.

It is not a weakly prime, because it can be changed into another prime (165601210447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82800605273 + 82800605274.

It is an arithmetic number, because the mean of its divisors is an integer number (82800605274).

Almost surely, 2^165601210547 is an apocalyptic number.

165601210547 is a deficient number, since it is larger than the sum of its proper divisors (1).

165601210547 is an equidigital number, since it uses as much as digits as its factorization.

165601210547 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50400, while the sum is 38.

The spelling of 165601210547 in words is "one hundred sixty-five billion, six hundred one million, two hundred ten thousand, five hundred forty-seven".