66147858 has 24 divisors (see below), whose sum is σ = 163795008. Its totient is φ = 18899352.

The previous prime is 66147853. The next prime is 66147859. The reversal of 66147858 is 85874166.

It is a happy number.

66147858 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (66147853) 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 11 ways as a sum of consecutive naturals, for example, 262366 + ... + 262617.

It is an arithmetic number, because the mean of its divisors is an integer number (6824792).

Almost surely, 2^66147858 is an apocalyptic number.

66147858 is an abundant number, since it is smaller than the sum of its proper divisors (97647150).

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

66147858 is a wasteful number, since it uses less digits than its factorization.

66147858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524998 (or 524995 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 66147858 is about 8133.1333445358. The cubic root of 66147858 is about 404.4255596439.

The spelling of 66147858 in words is "sixty-six million, one hundred forty-seven thousand, eight hundred fifty-eight".