161063500128691 has 2 divisors, whose sum is σ = 161063500128692. Its totient is φ = 161063500128690.

The previous prime is 161063500128683. The next prime is 161063500128851. The reversal of 161063500128691 is 196821005360161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161063500128691 - 2³ = 161063500128683 is a prime.

It is a super-2 number, since 2×161063500128691² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161063500122691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80531750064345 + 80531750064346.

It is an arithmetic number, because the mean of its divisors is an integer number (80531750064346).

Almost surely, 2^{161063500128691} is an apocalyptic number.

161063500128691 is a deficient number, since it is larger than the sum of its proper divisors (1).

161063500128691 is an equidigital number, since it uses as much as digits as its factorization.

161063500128691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 49.

The spelling of 161063500128691 in words is "one hundred sixty-one trillion, sixty-three billion, five hundred million, one hundred twenty-eight thousand, six hundred ninety-one".