66945004039 has 4 divisors (see below), whose sum is σ = 66952273320. Its totient is φ = 66937734760.

The previous prime is 66945004031. The next prime is 66945004043. The reversal of 66945004039 is 93040054966.

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 66945004039 - 2³ = 66945004031 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66945004039.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66945004031) 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, 3620809 + ... + 3639250.

It is an arithmetic number, because the mean of its divisors is an integer number (16738068330).

Almost surely, 2^66945004039 is an apocalyptic number.

66945004039 is a deficient number, since it is larger than the sum of its proper divisors (7269281).

66945004039 is an equidigital number, since it uses as much as digits as its factorization.

66945004039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7269280.

The product of its (nonzero) digits is 699840, while the sum is 46.

The spelling of 66945004039 in words is "sixty-six billion, nine hundred forty-five million, four thousand, thirty-nine".