19766936386 has 4 divisors (see below), whose sum is σ = 29650404582. Its totient is φ = 9883468192.

The previous prime is 19766936381. The next prime is 19766936443. The reversal of 19766936386 is 68363966791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68363966791 = 77291 ⋅884501.

It can be written as a sum of positive squares in only one way, i.e., 19122741225 + 644195161 = 138285^2 + 25381^2 .

It is not an unprimeable number, because it can be changed into a prime (19766936381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4941734095 + ... + 4941734098.

Almost surely, 2^19766936386 is an apocalyptic number.

19766936386 is a deficient number, since it is larger than the sum of its proper divisors (9883468196).

19766936386 is an equidigital number, since it uses as much as digits as its factorization.

19766936386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9883468195.

The product of its digits is 52907904, while the sum is 64.

The spelling of 19766936386 in words is "nineteen billion, seven hundred sixty-six million, nine hundred thirty-six thousand, three hundred eighty-six".