161868672908651 has 2 divisors, whose sum is σ = 161868672908652. Its totient is φ = 161868672908650.

The previous prime is 161868672908617. The next prime is 161868672908653. The reversal of 161868672908651 is 156809276868161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161868672908651 - 2⁶ = 161868672908587 is a prime.

Together with 161868672908653, 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 (161868672908653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80934336454325 + 80934336454326.

It is an arithmetic number, because the mean of its divisors is an integer number (80934336454326).

Almost surely, 2^{161868672908651} is an apocalyptic number.

161868672908651 is a deficient number, since it is larger than the sum of its proper divisors (1).

161868672908651 is an equidigital number, since it uses as much as digits as its factorization.

161868672908651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 418037760, while the sum is 74.

The spelling of 161868672908651 in words is "one hundred sixty-one trillion, eight hundred sixty-eight billion, six hundred seventy-two million, nine hundred eight thousand, six hundred fifty-one".