66386256997 has 8 divisors (see below), whose sum is σ = 70308945216. Its totient is φ = 62465525952.

The previous prime is 66386256983. The next prime is 66386257009. The reversal of 66386256997 is 79965268366.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66386256997 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 (66386256907) 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, 419163 + ... + 555400.

It is an arithmetic number, because the mean of its divisors is an integer number (8788618152).

Almost surely, 2^66386256997 is an apocalyptic number.

It is an amenable number.

66386256997 is a deficient number, since it is larger than the sum of its proper divisors (3922688219).

66386256997 is a wasteful number, since it uses less digits than its factorization.

66386256997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978587.

The product of its digits is 176359680, while the sum is 67.

The spelling of 66386256997 in words is "sixty-six billion, three hundred eighty-six million, two hundred fifty-six thousand, nine hundred ninety-seven".