66386733768291 has 8 divisors (see below), whose sum is σ = 88515757905424. Its totient is φ = 44257766071680.

The previous prime is 66386733768227. The next prime is 66386733768317. The reversal of 66386733768291 is 19286733768366.

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

It is not a de Polignac number, because 66386733768291 - 2⁶ = 66386733768227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66386733761291) 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, 11284786 + ... + 16128231.

It is an arithmetic number, because the mean of its divisors is an integer number (11064469738178).

Almost surely, 2^{66386733768291} is an apocalyptic number.

66386733768291 is a deficient number, since it is larger than the sum of its proper divisors (22129024137133).

66386733768291 is a wasteful number, since it uses less digits than its factorization.

66386733768291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28220261.

The product of its digits is 1975228416, while the sum is 75.

Adding to 66386733768291 its sum of digits (75), we get a palindrome (66386733768366).

The spelling of 66386733768291 in words is "sixty-six trillion, three hundred eighty-six billion, seven hundred thirty-three million, seven hundred sixty-eight thousand, two hundred ninety-one".