161198994898 has 16 divisors (see below), whose sum is σ = 242865527040. Its totient is φ = 80243973376.

The previous prime is 161198994883. The next prime is 161198994911. The reversal of 161198994898 is 898499891161.

It is a super-2 number, since 2×161198994898² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161198994898.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2197611 + ... + 2269777.

It is an arithmetic number, because the mean of its divisors is an integer number (15179095440).

Almost surely, 2^161198994898 is an apocalyptic number.

161198994898 is a deficient number, since it is larger than the sum of its proper divisors (81666532142).

161198994898 is a wasteful number, since it uses less digits than its factorization.

161198994898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77081.

The product of its digits is 80621568, while the sum is 73.

The spelling of 161198994898 in words is "one hundred sixty-one billion, one hundred ninety-eight million, nine hundred ninety-four thousand, eight hundred ninety-eight".