19915459357 has 2 divisors, whose sum is σ = 19915459358. Its totient is φ = 19915459356.

The previous prime is 19915459337. The next prime is 19915459373. The reversal of 19915459357 is 75395451991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19911749881 + 3709476 = 141109^2 + 1926^2 .

It is a cyclic number.

It is not a de Polignac number, because 19915459357 - 2¹⁹ = 19914935069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19915459337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9957729678 + 9957729679.

It is an arithmetic number, because the mean of its divisors is an integer number (9957729679).

Almost surely, 2^19915459357 is an apocalyptic number.

It is an amenable number.

19915459357 is a deficient number, since it is larger than the sum of its proper divisors (1).

19915459357 is an equidigital number, since it uses as much as digits as its factorization.

19915459357 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7654500, while the sum is 58.

The spelling of 19915459357 in words is "nineteen billion, nine hundred fifteen million, four hundred fifty-nine thousand, three hundred fifty-seven".