12697781646 has 32 divisors (see below), whose sum is σ = 27716393088. Its totient is φ = 3846126240.

The previous prime is 12697781623. The next prime is 12697781647. The reversal of 12697781646 is 64618779621.

It is a super-2 number, since 2×12697781646² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12697781647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113916 + ... + 195888.

It is an arithmetic number, because the mean of its divisors is an integer number (866137284).

Almost surely, 2^12697781646 is an apocalyptic number.

12697781646 is an abundant number, since it is smaller than the sum of its proper divisors (15018611442).

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

12697781646 is a wasteful number, since it uses less digits than its factorization.

12697781646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84336.

The product of its digits is 6096384, while the sum is 57.

The spelling of 12697781646 in words is "twelve billion, six hundred ninety-seven million, seven hundred eighty-one thousand, six hundred forty-six".