165561151064501 has 2 divisors, whose sum is σ = 165561151064502. Its totient is φ = 165561151064500.

The previous prime is 165561151064467. The next prime is 165561151064593. The reversal of 165561151064501 is 105460151165561.

165561151064501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86183279415025 + 79377871649476 = 9283495^2 + 8909426^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165561151064501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165561151066501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82780575532250 + 82780575532251.

It is an arithmetic number, because the mean of its divisors is an integer number (82780575532251).

Almost surely, 2^{165561151064501} is an apocalyptic number.

It is an amenable number.

165561151064501 is a deficient number, since it is larger than the sum of its proper divisors (1).

165561151064501 is an equidigital number, since it uses as much as digits as its factorization.

165561151064501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540000, while the sum is 47.

The spelling of 165561151064501 in words is "one hundred sixty-five trillion, five hundred sixty-one billion, one hundred fifty-one million, sixty-four thousand, five hundred one".