199618164 has 18 divisors (see below), whose sum is σ = 504590450. Its totient is φ = 66539376.

The previous prime is 199618157. The next prime is 199618183. The reversal of 199618164 is 461816991.

199618164 is a `hidden beast` number, since 19 + 9 + 618 + 16 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 192099600 + 7518564 = 13860^2 + 2742^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×199618164² = 79694822797461792, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2772439 + ... + 2772510.

Almost surely, 2^199618164 is an apocalyptic number.

It is an amenable number.

199618164 is an abundant number, since it is smaller than the sum of its proper divisors (304972286).

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

199618164 is a wasteful number, since it uses less digits than its factorization.

199618164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5544959 (or 5544954 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 199618164 is about 14128.6292328732. The cubic root of 199618164 is about 584.4311454686.

The spelling of 199618164 in words is "one hundred ninety-nine million, six hundred eighteen thousand, one hundred sixty-four".