12695694394 has 4 divisors (see below), whose sum is σ = 19043541594. Its totient is φ = 6347847196.

The previous prime is 12695694391. The next prime is 12695694421. The reversal of 12695694394 is 49349659621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49349659621 = 569 ⋅86730509.

It can be written as a sum of positive squares in only one way, i.e., 8942539225 + 3753155169 = 94565^2 + 61263^2 .

It is a super-2 number, since 2×12695694394² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (12695694391) 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 as a sum of consecutive naturals, namely, 3173923597 + ... + 3173923600.

Almost surely, 2^12695694394 is an apocalyptic number.

12695694394 is a deficient number, since it is larger than the sum of its proper divisors (6347847200).

12695694394 is an equidigital number, since it uses as much as digits as its factorization.

12695694394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6347847199.

The product of its digits is 12597120, while the sum is 58.

The spelling of 12695694394 in words is "twelve billion, six hundred ninety-five million, six hundred ninety-four thousand, three hundred ninety-four".