165616154209663 has 2 divisors, whose sum is σ = 165616154209664. Its totient is φ = 165616154209662.

The previous prime is 165616154209603. The next prime is 165616154209673. The reversal of 165616154209663 is 366902451616561.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165616154209663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165616154209603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82808077104831 + 82808077104832.

It is an arithmetic number, because the mean of its divisors is an integer number (82808077104832).

Almost surely, 2^{165616154209663} is an apocalyptic number.

165616154209663 is a deficient number, since it is larger than the sum of its proper divisors (1).

165616154209663 is an equidigital number, since it uses as much as digits as its factorization.

165616154209663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41990400, while the sum is 61.

The spelling of 165616154209663 in words is "one hundred sixty-five trillion, six hundred sixteen billion, one hundred fifty-four million, two hundred nine thousand, six hundred sixty-three".