161858995187 has 2 divisors, whose sum is σ = 161858995188. Its totient is φ = 161858995186.

The previous prime is 161858995121. The next prime is 161858995229. The reversal of 161858995187 is 781599858161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161858995187 - 2²² = 161854800883 is a prime.

It is not a weakly prime, because it can be changed into another prime (161858995087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80929497593 + 80929497594.

It is an arithmetic number, because the mean of its divisors is an integer number (80929497594).

Almost surely, 2^161858995187 is an apocalyptic number.

161858995187 is a deficient number, since it is larger than the sum of its proper divisors (1).

161858995187 is an equidigital number, since it uses as much as digits as its factorization.

161858995187 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43545600, while the sum is 68.

The spelling of 161858995187 in words is "one hundred sixty-one billion, eight hundred fifty-eight million, nine hundred ninety-five thousand, one hundred eighty-seven".