188841209797 has 18 divisors (see below), whose sum is σ = 195468999558. Its totient is φ = 182304858384.

The previous prime is 188841209783. The next prime is 188841209831. The reversal of 188841209797 is 797902148881.

It can be written as a sum of positive squares in only one way, i.e., 183737393316 + 5103816481 = 428646^2 + 71441^2 .

It is not a de Polignac number, because 188841209797 - 2¹¹ = 188841207749 is a prime.

It is a super-2 number, since 2×188841209797² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188841209707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 526019904 + ... + 526020262.

Almost surely, 2^188841209797 is an apocalyptic number.

It is an amenable number.

188841209797 is a deficient number, since it is larger than the sum of its proper divisors (6627789761).

188841209797 is an frugal number, since it uses more digits than its factorization.

188841209797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1153 (or 595 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 64.

The spelling of 188841209797 in words is "one hundred eighty-eight billion, eight hundred forty-one million, two hundred nine thousand, seven hundred ninety-seven".