66643426 has 8 divisors (see below), whose sum is σ = 101457360. Its totient is φ = 32824308.

The previous prime is 66643403. The next prime is 66643427. The reversal of 66643426 is 62434666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (66643427) 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, 248536 + ... + 248803.

It is an arithmetic number, because the mean of its divisors is an integer number (12682170).

Almost surely, 2^66643426 is an apocalyptic number.

66643426 is a deficient number, since it is larger than the sum of its proper divisors (34813934).

66643426 is a wasteful number, since it uses less digits than its factorization.

66643426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497408.

The product of its digits is 124416, while the sum is 37.

The square root of 66643426 is about 8163.5424908553. The cubic root of 66643426 is about 405.4330094188.

The spelling of 66643426 in words is "sixty-six million, six hundred forty-three thousand, four hundred twenty-six".