161398558 has 8 divisors (see below), whose sum is σ = 246066840. Its totient is φ = 79376280.

The previous prime is 161398553. The next prime is 161398577. The reversal of 161398558 is 855893161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161398553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 661348 + ... + 661591.

It is an arithmetic number, because the mean of its divisors is an integer number (30758355).

Almost surely, 2^161398558 is an apocalyptic number.

161398558 is a deficient number, since it is larger than the sum of its proper divisors (84668282).

161398558 is a wasteful number, since it uses less digits than its factorization.

161398558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323002.

The product of its digits is 259200, while the sum is 46.

The square root of 161398558 is about 12704.2732180948. The cubic root of 161398558 is about 544.4607161626.

The spelling of 161398558 in words is "one hundred sixty-one million, three hundred ninety-eight thousand, five hundred fifty-eight".