19802539951 has 2 divisors, whose sum is σ = 19802539952. Its totient is φ = 19802539950.

The previous prime is 19802539943. The next prime is 19802539963. The reversal of 19802539951 is 15993520891.

It is a weak prime.

It is an emirp because it is prime and its reverse (15993520891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19802539951 - 2³ = 19802539943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19802539901) 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 as a sum of consecutive naturals, namely, 9901269975 + 9901269976.

It is an arithmetic number, because the mean of its divisors is an integer number (9901269976).

Almost surely, 2^19802539951 is an apocalyptic number.

19802539951 is a deficient number, since it is larger than the sum of its proper divisors (1).

19802539951 is an equidigital number, since it uses as much as digits as its factorization.

19802539951 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 874800, while the sum is 52.

The spelling of 19802539951 in words is "nineteen billion, eight hundred two million, five hundred thirty-nine thousand, nine hundred fifty-one".