161642998 has 16 divisors (see below), whose sum is σ = 267696576. Its totient is φ = 72588040.

The previous prime is 161642983. The next prime is 161643017. The reversal of 161642998 is 899246161.

It is a happy number.

It is a super-2 number, since 2×161642998² = 52256917604856008, which contains 22 as substring.

It is a congruent number.

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, 42436 + ... + 46087.

It is an arithmetic number, because the mean of its divisors is an integer number (16731036).

Almost surely, 2^161642998 is an apocalyptic number.

161642998 is a deficient number, since it is larger than the sum of its proper divisors (106053578).

161642998 is a wasteful number, since it uses less digits than its factorization.

161642998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88619.

The product of its digits is 186624, while the sum is 46.

The square root of 161642998 is about 12713.8899633432. The cubic root of 161642998 is about 544.7354415542.

The spelling of 161642998 in words is "one hundred sixty-one million, six hundred forty-two thousand, nine hundred ninety-eight".