197111136784 has 45 divisors (see below), whose sum is σ = 405751308807. Its totient is φ = 92743974912.

The previous prime is 197111136757. The next prime is 197111136791. The reversal of 197111136784 is 487631111791.

The square root of 197111136784 is 443972.

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

It can be written as a sum of positive squares in 4 ways, for example, as 7126736400 + 189984400384 = 84420^2 + 435872^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 30186832 + ... + 30193360.

Almost surely, 2^197111136784 is an apocalyptic number.

197111136784 is the 443972-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 197111136784

197111136784 is an abundant number, since it is smaller than the sum of its proper divisors (208640172023).

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

197111136784 is an frugal number, since it uses more digits than its factorization.

197111136784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13100 (or 6548 counting only the distinct ones).

The product of its digits is 254016, while the sum is 49.

Multiplying 197111136784 by its sum of digits (49), we get a square (9658445702416 = 3107804²).

The spelling of 197111136784 in words is "one hundred ninety-seven billion, one hundred eleven million, one hundred thirty-six thousand, seven hundred eighty-four".