12696581378 has 16 divisors (see below), whose sum is σ = 20511796536. Its totient is φ = 5859408000.

The previous prime is 12696581377. The next prime is 12696581533. The reversal of 12696581378 is 87318569621.

It can be written as a sum of positive squares in 4 ways, for example, as 11209939129 + 1486642249 = 105877^2 + 38557^2 .

It is a super-2 number, since 2×12696581378² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12696581377) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 415628 + ... + 445128.

Almost surely, 2^12696581378 is an apocalyptic number.

12696581378 is a deficient number, since it is larger than the sum of its proper divisors (7815215158).

12696581378 is a wasteful number, since it uses less digits than its factorization.

12696581378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46069.

The product of its digits is 4354560, while the sum is 56.

The spelling of 12696581378 in words is "twelve billion, six hundred ninety-six million, five hundred eighty-one thousand, three hundred seventy-eight".