66986626 has 48 divisors (see below), whose sum is σ = 123513984. Its totient is φ = 27113856.

The previous prime is 66986611. The next prime is 66986627. The reversal of 66986626 is 62668966.

It is a happy number.

66986626 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a self number, because there is not a number n which added to its sum of digits gives 66986626.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66986627) 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 23 ways as a sum of consecutive naturals, for example, 254571 + ... + 254833.

It is an arithmetic number, because the mean of its divisors is an integer number (2573208).

Almost surely, 2^66986626 is an apocalyptic number.

66986626 is a deficient number, since it is larger than the sum of its proper divisors (56527358).

66986626 is a wasteful number, since it uses less digits than its factorization.

66986626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415 (or 408 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 49.

The square root of 66986626 is about 8184.5357840259. The cubic root of 66986626 is about 406.1277837963.

The spelling of 66986626 in words is "sixty-six million, nine hundred eighty-six thousand, six hundred twenty-six".