66643494 has 8 divisors (see below), whose sum is σ = 133287000. Its totient is φ = 22214496.

The previous prime is 66643487. The next prime is 66643523. The reversal of 66643494 is 49434666.

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

66643494 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5553619 + ... + 5553630.

It is an arithmetic number, because the mean of its divisors is an integer number (16660875).

Almost surely, 2^66643494 is an apocalyptic number.

66643494 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66643494 is a wasteful number, since it uses less digits than its factorization.

66643494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11107254.

The product of its digits is 373248, while the sum is 42.

The square root of 66643494 is about 8163.5466557128. The cubic root of 66643494 is about 405.4331473141.

The spelling of 66643494 in words is "sixty-six million, six hundred forty-three thousand, four hundred ninety-four".