66868696447 has 8 divisors (see below), whose sum is σ = 76423884800. Its totient is φ = 57314137464.

The previous prime is 66868696439. The next prime is 66868696487. The reversal of 66868696447 is 74469686866.

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

It is a cyclic number.

It is not a de Polignac number, because 66868696447 - 2³ = 66868696439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66868696487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97954 + ... + 378592.

It is an arithmetic number, because the mean of its divisors is an integer number (9552985600).

Almost surely, 2^66868696447 is an apocalyptic number.

66868696447 is a deficient number, since it is larger than the sum of its proper divisors (9555188353).

66868696447 is a wasteful number, since it uses less digits than its factorization.

66868696447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314685.

The product of its digits is 501645312, while the sum is 70.

The spelling of 66868696447 in words is "sixty-six billion, eight hundred sixty-eight million, six hundred ninety-six thousand, four hundred forty-seven".