19766677666766 has 4 divisors (see below), whose sum is σ = 29650016500152. Its totient is φ = 9883338833382.

The previous prime is 19766677666739. The next prime is 19766677666781. The reversal of 19766677666766 is 66766677666791.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4941669416690 + ... + 4941669416693.

It is an arithmetic number, because the mean of its divisors is an integer number (7412504125038).

Almost surely, 2^{19766677666766} is an apocalyptic number.

19766677666766 is a deficient number, since it is larger than the sum of its proper divisors (9883338833386).

19766677666766 is an equidigital number, since it uses as much as digits as its factorization.

19766677666766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9883338833385.

The product of its digits is 36294822144, while the sum is 86.

The spelling of 19766677666766 in words is "nineteen trillion, seven hundred sixty-six billion, six hundred seventy-seven million, six hundred sixty-six thousand, seven hundred sixty-six".