19774876871 has 4 divisors (see below), whose sum is σ = 19856930544. Its totient is φ = 19692823200.

The previous prime is 19774876853. The next prime is 19774876873. The reversal of 19774876871 is 17867847791.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19774876871 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19774876798 and 19774876807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19774876873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41026475 + ... + 41026956.

It is an arithmetic number, because the mean of its divisors is an integer number (4964232636).

Almost surely, 2^19774876871 is an apocalyptic number.

19774876871 is a deficient number, since it is larger than the sum of its proper divisors (82053673).

19774876871 is an equidigital number, since it uses as much as digits as its factorization.

19774876871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82053672.

The product of its digits is 33191424, while the sum is 65.

The spelling of 19774876871 in words is "nineteen billion, seven hundred seventy-four million, eight hundred seventy-six thousand, eight hundred seventy-one".