66863866836866 has 8 divisors (see below), whose sum is σ = 109413600278544. Its totient is φ = 30392666744020.

The previous prime is 66863866836857. The next prime is 66863866836881.

66863866836866 is nontrivially palindromic in base 10.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1519633337180 + ... + 1519633337223.

It is an arithmetic number, because the mean of its divisors is an integer number (13676700034818).

Almost surely, 2^{66863866836866} is an apocalyptic number.

66863866836866 is a deficient number, since it is larger than the sum of its proper divisors (42549733441678).

66863866836866 is a wasteful number, since it uses less digits than its factorization.

66863866836866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3039266674416.

The product of its digits is 61917364224, while the sum is 86.

The spelling of 66863866836866 in words is "sixty-six trillion, eight hundred sixty-three billion, eight hundred sixty-six million, eight hundred thirty-six thousand, eight hundred sixty-six".