19678869961 has 4 divisors (see below), whose sum is σ = 19724529024. Its totient is φ = 19633210900.

The previous prime is 19678869871. The next prime is 19678869983. The reversal of 19678869961 is 16996887691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19678869961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19678860961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22828885 + ... + 22829746.

It is an arithmetic number, because the mean of its divisors is an integer number (4931132256).

Almost surely, 2^19678869961 is an apocalyptic number.

It is an amenable number.

19678869961 is a deficient number, since it is larger than the sum of its proper divisors (45659063).

19678869961 is an equidigital number, since it uses as much as digits as its factorization.

19678869961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45659062.

The product of its digits is 70543872, while the sum is 70.

The spelling of 19678869961 in words is "nineteen billion, six hundred seventy-eight million, eight hundred sixty-nine thousand, nine hundred sixty-one".