16165666655651 has 2 divisors, whose sum is σ = 16165666655652. Its totient is φ = 16165666655650.

The previous prime is 16165666655647. The next prime is 16165666655653. The reversal of 16165666655651 is 15655666656161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16165666655651 - 2² = 16165666655647 is a prime.

It is a super-2 number, since 2×16165666655651² (a number of 27 digits) contains 22 as substring.

Together with 16165666655653, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16165666655653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8082833327825 + 8082833327826.

It is an arithmetic number, because the mean of its divisors is an integer number (8082833327826).

Almost surely, 2^{16165666655651} is an apocalyptic number.

16165666655651 is a deficient number, since it is larger than the sum of its proper divisors (1).

16165666655651 is an equidigital number, since it uses as much as digits as its factorization.

16165666655651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960000, while the sum is 65.

The spelling of 16165666655651 in words is "sixteen trillion, one hundred sixty-five billion, six hundred sixty-six million, six hundred fifty-five thousand, six hundred fifty-one".