12695840538 has 64 divisors (see below), whose sum is σ = 25935541632. Its totient is φ = 4142592000.

The previous prime is 12695840537. The next prime is 12695840543. The reversal of 12695840538 is 83504859621.

It is a super-2 number, since 2×12695840538² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12695840537) 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 31 ways as a sum of consecutive naturals, for example, 34036920 + ... + 34037292.

It is an arithmetic number, because the mean of its divisors is an integer number (405242838).

Almost surely, 2^12695840538 is an apocalyptic number.

12695840538 is an abundant number, since it is smaller than the sum of its proper divisors (13239701094).

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

12695840538 is a wasteful number, since it uses less digits than its factorization.

12695840538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959.

The product of its (nonzero) digits is 2073600, while the sum is 51.

The spelling of 12695840538 in words is "twelve billion, six hundred ninety-five million, eight hundred forty thousand, five hundred thirty-eight".