161901108442 has 32 divisors (see below), whose sum is σ = 250570247040. Its totient is φ = 78428528640.

The previous prime is 161901108437. The next prime is 161901108461. The reversal of 161901108442 is 244801109161.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2020698 + ... + 2099290.

It is an arithmetic number, because the mean of its divisors is an integer number (7830320220).

Almost surely, 2^161901108442 is an apocalyptic number.

161901108442 is a deficient number, since it is larger than the sum of its proper divisors (88669138598).

161901108442 is a wasteful number, since it uses less digits than its factorization.

161901108442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78918.

The product of its (nonzero) digits is 13824, while the sum is 37.

The spelling of 161901108442 in words is "one hundred sixty-one billion, nine hundred one million, one hundred eight thousand, four hundred forty-two".