19896778827 has 6 divisors (see below), whose sum is σ = 28739791652. Its totient is φ = 13264519212.

The previous prime is 19896778817. The next prime is 19896778859. The reversal of 19896778827 is 72887769891.

It is not a de Polignac number, because 19896778827 - 2¹⁸ = 19896516683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19896778817) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1105376593 + ... + 1105376610.

Almost surely, 2^19896778827 is an apocalyptic number.

19896778827 is a deficient number, since it is larger than the sum of its proper divisors (8843012825).

19896778827 is a wasteful number, since it uses less digits than its factorization.

19896778827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2210753209 (or 2210753206 counting only the distinct ones).

The product of its digits is 170698752, while the sum is 72.

It can be divided in two parts, 1989 and 6778827, that added together give a square (6780816 = 2604²).

The spelling of 19896778827 in words is "nineteen billion, eight hundred ninety-six million, seven hundred seventy-eight thousand, eight hundred twenty-seven".