161698608 has 90 divisors (see below), whose sum is σ = 460859516. Its totient is φ = 52923456.

The previous prime is 161698597. The next prime is 161698609. The reversal of 161698608 is 806896161.

It is a happy number.

It is a super-2 number, since 2×161698608² = 52292879658275328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161698609) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 991935 + ... + 992097.

Almost surely, 2^161698608 is an apocalyptic number.

161698608 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161698608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230429758).

161698608 is an abundant number, since it is smaller than the sum of its proper divisors (299160908).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161698608 is a wasteful number, since it uses less digits than its factorization.

161698608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 161698608 is about 12716.0767534645. The cubic root of 161698608 is about 544.7979027910.

The spelling of 161698608 in words is "one hundred sixty-one million, six hundred ninety-eight thousand, six hundred eight".