66194368 has 56 divisors (see below), whose sum is σ = 138367008. Its totient is φ = 31358976.

The previous prime is 66194363. The next prime is 66194407. The reversal of 66194368 is 86349166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66194363) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 283980 + ... + 284212.

Almost surely, 2^66194368 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66194368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69183504).

66194368 is an abundant number, since it is smaller than the sum of its proper divisors (72172640).

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

66194368 is a wasteful number, since it uses less digits than its factorization.

66194368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461 (or 451 counting only the distinct ones).

The product of its digits is 186624, while the sum is 43.

The square root of 66194368 is about 8135.9921337228. The cubic root of 66194368 is about 404.5203242441.

The spelling of 66194368 in words is "sixty-six million, one hundred ninety-four thousand, three hundred sixty-eight".