66822657 has 12 divisors (see below), whose sum is σ = 97264944. Its totient is φ = 40470120.

The previous prime is 66822617. The next prime is 66822689. The reversal of 66822657 is 75622866.

66822657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66822657 - 2⁶ = 66822593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66822617) 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, 46248 + ... + 47670.

It is an arithmetic number, because the mean of its divisors is an integer number (8105412).

Almost surely, 2^66822657 is an apocalyptic number.

It is an amenable number.

66822657 is a deficient number, since it is larger than the sum of its proper divisors (30442287).

66822657 is an equidigital number, since it uses as much as digits as its factorization.

66822657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2860 (or 1437 counting only the distinct ones).

The product of its digits is 241920, while the sum is 42.

The square root of 66822657 is about 8174.5126460236. The cubic root of 66822657 is about 405.7961416004.

It can be divided in two parts, 6682 and 2657, that added together give a palindrome (9339).

The spelling of 66822657 in words is "sixty-six million, eight hundred twenty-two thousand, six hundred fifty-seven".