19197765136 has 135 divisors (see below), whose sum is σ = 42405669327. Its totient is φ = 8413120320.

The previous prime is 19197765131. The next prime is 19197765211. The reversal of 19197765136 is 63156779191.

The square root of 19197765136 is 138556.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19197765131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 286533775 + ... + 286533841.

Almost surely, 2^19197765136 is an apocalyptic number.

19197765136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

19197765136 is the 138556-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19197765136

19197765136 is an abundant number, since it is smaller than the sum of its proper divisors (23207904191).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19197765136 is an equidigital number, since it uses as much as digits as its factorization.

19197765136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258 (or 127 counting only the distinct ones).

The product of its digits is 2143260, while the sum is 55.

The spelling of 19197765136 in words is "nineteen billion, one hundred ninety-seven million, seven hundred sixty-five thousand, one hundred thirty-six".