165644064611 has 2 divisors, whose sum is σ = 165644064612. Its totient is φ = 165644064610.

The previous prime is 165644064589. The next prime is 165644064659. The reversal of 165644064611 is 116460446561.

It is a weak prime.

It is an emirp because it is prime and its reverse (116460446561) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165644064611 is a prime.

It is a super-2 number, since 2×165644064611² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (165644064661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82822032305 + 82822032306.

It is an arithmetic number, because the mean of its divisors is an integer number (82822032306).

Almost surely, 2^165644064611 is an apocalyptic number.

165644064611 is a deficient number, since it is larger than the sum of its proper divisors (1).

165644064611 is an equidigital number, since it uses as much as digits as its factorization.

165644064611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 44.

The spelling of 165644064611 in words is "one hundred sixty-five billion, six hundred forty-four million, sixty-four thousand, six hundred eleven".