19778416433 has 2 divisors, whose sum is σ = 19778416434. Its totient is φ = 19778416432.

The previous prime is 19778416409. The next prime is 19778416459. The reversal of 19778416433 is 33461487791.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18683335969 + 1095080464 = 136687^2 + 33092^2 .

It is a cyclic number.

It is not a de Polignac number, because 19778416433 - 2¹⁸ = 19778154289 is a prime.

It is not a weakly prime, because it can be changed into another prime (19778416633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9889208216 + 9889208217.

It is an arithmetic number, because the mean of its divisors is an integer number (9889208217).

Almost surely, 2^19778416433 is an apocalyptic number.

It is an amenable number.

19778416433 is a deficient number, since it is larger than the sum of its proper divisors (1).

19778416433 is an equidigital number, since it uses as much as digits as its factorization.

19778416433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 53.

The spelling of 19778416433 in words is "nineteen billion, seven hundred seventy-eight million, four hundred sixteen thousand, four hundred thirty-three".