66522643 has 4 divisors (see below), whose sum is σ = 72570168. Its totient is φ = 60475120.

The previous prime is 66522619. The next prime is 66522713. The reversal of 66522643 is 34622566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66522643 - 2⁵ = 66522611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66522599 and 66522608.

It is not an unprimeable number, because it can be changed into a prime (66523643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3023746 + ... + 3023767.

It is an arithmetic number, because the mean of its divisors is an integer number (18142542).

Almost surely, 2^66522643 is an apocalyptic number.

66522643 is a deficient number, since it is larger than the sum of its proper divisors (6047525).

66522643 is a wasteful number, since it uses less digits than its factorization.

66522643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6047524.

The product of its digits is 51840, while the sum is 34.

The square root of 66522643 is about 8156.1414283962. The cubic root of 66522643 is about 405.1879288379.

The spelling of 66522643 in words is "sixty-six million, five hundred twenty-two thousand, six hundred forty-three".