166361598 has 48 divisors (see below), whose sum is σ = 393534960. Its totient is φ = 50481792.

The previous prime is 166361581. The next prime is 166361621. The reversal of 166361598 is 895163661.

166361598 is a `hidden beast` number, since 1 + 6 + 636 + 1 + 5 + 9 + 8 = 666.

It is a super-2 number, since 2×166361598² = 55352362578227208, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12213 + ... + 21951.

It is an arithmetic number, because the mean of its divisors is an integer number (8198645).

Almost surely, 2^166361598 is an apocalyptic number.

166361598 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 166361598, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196767480).

166361598 is an abundant number, since it is smaller than the sum of its proper divisors (227173362).

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

166361598 is a wasteful number, since it uses less digits than its factorization.

166361598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9833 (or 9830 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 166361598 is about 12898.1238170518. The cubic root of 166361598 is about 549.9852315594.

The spelling of 166361598 in words is "one hundred sixty-six million, three hundred sixty-one thousand, five hundred ninety-eight".