19881254879 has 2 divisors, whose sum is σ = 19881254880. Its totient is φ = 19881254878.

The previous prime is 19881254867. The next prime is 19881254933. The reversal of 19881254879 is 97845218891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19881254879 - 2⁴ = 19881254863 is a prime.

It is a super-2 number, since 2×19881254879² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19881254479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9940627439 + 9940627440.

It is an arithmetic number, because the mean of its divisors is an integer number (9940627440).

Almost surely, 2^19881254879 is an apocalyptic number.

19881254879 is a deficient number, since it is larger than the sum of its proper divisors (1).

19881254879 is an equidigital number, since it uses as much as digits as its factorization.

19881254879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11612160, while the sum is 62.

The spelling of 19881254879 in words is "nineteen billion, eight hundred eighty-one million, two hundred fifty-four thousand, eight hundred seventy-nine".