66863836797 has 32 divisors (see below), whose sum is σ = 94157033472. Its totient is φ = 42122524224.

The previous prime is 66863836763. The next prime is 66863836817. The reversal of 66863836797 is 79763836866.

It is a happy number.

It is not a de Polignac number, because 66863836797 - 2²³ = 66855448189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66863836727) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2697223 + ... + 2721899.

It is an arithmetic number, because the mean of its divisors is an integer number (2942407296).

Almost surely, 2^66863836797 is an apocalyptic number.

It is an amenable number.

66863836797 is a deficient number, since it is larger than the sum of its proper divisors (27293196675).

66863836797 is a wasteful number, since it uses less digits than its factorization.

66863836797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25177.

The product of its digits is 329204736, while the sum is 69.

Adding to 66863836797 its sum of digits (69), we get a palindrome (66863836866).

It can be divided in two parts, 6686 and 3836797, that added together give a palindrome (3843483).

The spelling of 66863836797 in words is "sixty-six billion, eight hundred sixty-three million, eight hundred thirty-six thousand, seven hundred ninety-seven".