2681549681197 has 4 divisors (see below), whose sum is σ = 2839287897756. Its totient is φ = 2523811464640.

The previous prime is 2681549681183. The next prime is 2681549681267. The reversal of 2681549681197 is 7911869451862.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1004553171076 + 1676996510121 = 1002274^2 + 1294989^2 .

It is not a de Polignac number, because 2681549681197 - 2³⁵ = 2647189942829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2681549681597) 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 3 ways as a sum of consecutive naturals, for example, 78869108254 + ... + 78869108287.

It is an arithmetic number, because the mean of its divisors is an integer number (709821974439).

Almost surely, 2^{2681549681197} is an apocalyptic number.

It is an amenable number.

2681549681197 is a deficient number, since it is larger than the sum of its proper divisors (157738216559).

2681549681197 is a wasteful number, since it uses less digits than its factorization.

2681549681197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157738216558.

The product of its digits is 52254720, while the sum is 67.

The spelling of 2681549681197 in words is "two trillion, six hundred eighty-one billion, five hundred forty-nine million, six hundred eighty-one thousand, one hundred ninety-seven".