19881254933 has 2 divisors, whose sum is σ = 19881254934. Its totient is φ = 19881254932.

The previous prime is 19881254879. The next prime is 19881254951. The reversal of 19881254933 is 33945218891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19342690084 + 538564849 = 139078^2 + 23207^2 .

It is a cyclic number.

It is not a de Polignac number, because 19881254933 - 2¹⁴ = 19881238549 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19881254033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9940627466 + 9940627467.

It is an arithmetic number, because the mean of its divisors is an integer number (9940627467).

Almost surely, 2^19881254933 is an apocalyptic number.

It is an amenable number.

19881254933 is a deficient number, since it is larger than the sum of its proper divisors (1).

19881254933 is an equidigital number, since it uses as much as digits as its factorization.

19881254933 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 53.

The spelling of 19881254933 in words is "nineteen billion, eight hundred eighty-one million, two hundred fifty-four thousand, nine hundred thirty-three".