165225515639 has 2 divisors, whose sum is σ = 165225515640. Its totient is φ = 165225515638.

The previous prime is 165225515591. The next prime is 165225515659. The reversal of 165225515639 is 936515522561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165225515639 - 2¹² = 165225511543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165225515659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82612757819 + 82612757820.

It is an arithmetic number, because the mean of its divisors is an integer number (82612757820).

Almost surely, 2^165225515639 is an apocalyptic number.

165225515639 is a deficient number, since it is larger than the sum of its proper divisors (1).

165225515639 is an equidigital number, since it uses as much as digits as its factorization.

165225515639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2430000, while the sum is 50.

The spelling of 165225515639 in words is "one hundred sixty-five billion, two hundred twenty-five million, five hundred fifteen thousand, six hundred thirty-nine".