66720184582 has 4 divisors (see below), whose sum is σ = 100080276876. Its totient is φ = 33360092290.

The previous prime is 66720184579. The next prime is 66720184591. The reversal of 66720184582 is 28548102766.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16680046144 + ... + 16680046147.

It is an arithmetic number, because the mean of its divisors is an integer number (25020069219).

Almost surely, 2^66720184582 is an apocalyptic number.

66720184582 is a deficient number, since it is larger than the sum of its proper divisors (33360092294).

66720184582 is a wasteful number, since it uses less digits than its factorization.

66720184582 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33360092293.

The product of its (nonzero) digits is 1290240, while the sum is 49.

The spelling of 66720184582 in words is "sixty-six billion, seven hundred twenty million, one hundred eighty-four thousand, five hundred eighty-two".