19800537597 has 48 divisors (see below), whose sum is σ = 30906914688. Its totient is φ = 12184698240.

The previous prime is 19800537563. The next prime is 19800537599. The reversal of 19800537597 is 79573500891.

19800537597 is a `hidden beast` number, since 19 + 8 + 0 + 0 + 5 + 37 + 597 = 666.

It is not a de Polignac number, because 19800537597 - 2¹⁰ = 19800536573 is a prime.

It is a super-2 number, since 2×19800537597² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19800537599) 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 in 47 ways as a sum of consecutive naturals, for example, 654438 + ... + 684024.

It is an arithmetic number, because the mean of its divisors is an integer number (643894056).

Almost surely, 2^19800537597 is an apocalyptic number.

It is an amenable number.

19800537597 is a deficient number, since it is larger than the sum of its proper divisors (11106377091).

19800537597 is a wasteful number, since it uses less digits than its factorization.

19800537597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29730 (or 29727 counting only the distinct ones).

The product of its (nonzero) digits is 2381400, while the sum is 54.

The spelling of 19800537597 in words is "nineteen billion, eight hundred million, five hundred thirty-seven thousand, five hundred ninety-seven".