66641782 has 8 divisors (see below), whose sum is σ = 100005696. Its totient is φ = 33306552.

The previous prime is 66641761. The next prime is 66641801. The reversal of 66641782 is 28714666.

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

It is a super-2 number, since 2×66641782² = 8882254216271048, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123 + ... + 11545.

It is an arithmetic number, because the mean of its divisors is an integer number (12500712).

Almost surely, 2^66641782 is an apocalyptic number.

66641782 is a deficient number, since it is larger than the sum of its proper divisors (33363914).

66641782 is a wasteful number, since it uses less digits than its factorization.

66641782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14342.

The product of its digits is 96768, while the sum is 40.

The square root of 66641782 is about 8163.4417986533. The cubic root of 66641782 is about 405.4296755699.

The spelling of 66641782 in words is "sixty-six million, six hundred forty-one thousand, seven hundred eighty-two".