66378967747 has 8 divisors (see below), whose sum is σ = 66449933312. Its totient is φ = 66308041800.

The previous prime is 66378967729. The next prime is 66378967751. The reversal of 66378967747 is 74776987366.

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 66378967747 - 2¹¹ = 66378965699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66378967757) 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, 4271722 + ... + 4287232.

It is an arithmetic number, because the mean of its divisors is an integer number (8306241664).

Almost surely, 2^66378967747 is an apocalyptic number.

66378967747 is a deficient number, since it is larger than the sum of its proper divisors (70965565).

66378967747 is a wasteful number, since it uses less digits than its factorization.

66378967747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19809.

The product of its digits is 448084224, while the sum is 70.

The spelling of 66378967747 in words is "sixty-six billion, three hundred seventy-eight million, nine hundred sixty-seven thousand, seven hundred forty-seven".