19514615849 has 2 divisors, whose sum is σ = 19514615850. Its totient is φ = 19514615848.

The previous prime is 19514615839. The next prime is 19514615927. The reversal of 19514615849 is 94851641591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19453275625 + 61340224 = 139475^2 + 7832^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19514615849 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19514615849.

It is not a weakly prime, because it can be changed into another prime (19514615819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9757307924 + 9757307925.

It is an arithmetic number, because the mean of its divisors is an integer number (9757307925).

Almost surely, 2^19514615849 is an apocalyptic number.

It is an amenable number.

19514615849 is a deficient number, since it is larger than the sum of its proper divisors (1).

19514615849 is an equidigital number, since it uses as much as digits as its factorization.

19514615849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555200, while the sum is 53.

The spelling of 19514615849 in words is "nineteen billion, five hundred fourteen million, six hundred fifteen thousand, eight hundred forty-nine".