19499599837 has 2 divisors, whose sum is σ = 19499599838. Its totient is φ = 19499599836.

The previous prime is 19499599793. The next prime is 19499599883. The reversal of 19499599837 is 73899599491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18109354041 + 1390245796 = 134571^2 + 37286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19499599837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19499599837.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19499599337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9749799918 + 9749799919.

It is an arithmetic number, because the mean of its divisors is an integer number (9749799919).

Almost surely, 2^19499599837 is an apocalyptic number.

It is an amenable number.

19499599837 is a deficient number, since it is larger than the sum of its proper divisors (1).

19499599837 is an equidigital number, since it uses as much as digits as its factorization.

19499599837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 198404640, while the sum is 73.

The spelling of 19499599837 in words is "nineteen billion, four hundred ninety-nine million, five hundred ninety-nine thousand, eight hundred thirty-seven".