161858995199 has 16 divisors (see below), whose sum is σ = 177156994560. Its totient is φ = 146658936960.

The previous prime is 161858995187. The next prime is 161858995229. The reversal of 161858995199 is 991599858161.

It is a cyclic number.

It is not a de Polignac number, because 161858995199 - 2⁸ = 161858994943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161858955199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4932404 + ... + 4965110.

It is an arithmetic number, because the mean of its divisors is an integer number (11072312160).

Almost surely, 2^161858995199 is an apocalyptic number.

161858995199 is a deficient number, since it is larger than the sum of its proper divisors (15297999361).

161858995199 is a wasteful number, since it uses less digits than its factorization.

161858995199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34190.

The product of its digits is 62985600, while the sum is 71.

The spelling of 161858995199 in words is "one hundred sixty-one billion, eight hundred fifty-eight million, nine hundred ninety-five thousand, one hundred ninety-nine".