66019400 has 24 divisors (see below), whose sum is σ = 153495570. Its totient is φ = 26407680.

The previous prime is 66019351. The next prime is 66019403. The reversal of 66019400 is 491066.

66019400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 57851236 + 8168164 = 7606^2 + 2858^2 .

It is a super-2 number, since 2×66019400² = 8717122352720000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66019400.

It is not an unprimeable number, because it can be changed into a prime (66019403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 164849 + ... + 165248.

Almost surely, 2^66019400 is an apocalyptic number.

It is an amenable number.

66019400 is an abundant number, since it is smaller than the sum of its proper divisors (87476170).

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

66019400 is a wasteful number, since it uses less digits than its factorization.

66019400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330113 (or 330104 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 66019400 is about 8125.2323043714. The cubic root of 66019400 is about 404.1635941713.

The spelling of 66019400 in words is "sixty-six million, nineteen thousand, four hundred".