19800537599 has 2 divisors, whose sum is σ = 19800537600. Its totient is φ = 19800537598.

The previous prime is 19800537563. The next prime is 19800537637. The reversal of 19800537599 is 99573500891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19800537599 - 2⁸ = 19800537343 is a prime.

It is a super-2 number, since 2×19800537599² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19800530599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9900268799 + 9900268800.

It is an arithmetic number, because the mean of its divisors is an integer number (9900268800).

Almost surely, 2^19800537599 is an apocalyptic number.

19800537599 is a deficient number, since it is larger than the sum of its proper divisors (1).

19800537599 is an equidigital number, since it uses as much as digits as its factorization.

19800537599 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3061800, while the sum is 56.

The spelling of 19800537599 in words is "nineteen billion, eight hundred million, five hundred thirty-seven thousand, five hundred ninety-nine".