12694591324809 has 27 divisors (see below), whose sum is σ = 19041352445037. Its totient is φ = 8462868484068.

The previous prime is 12694591324801. The next prime is 12694591324841. The reversal of 12694591324809 is 90842319549621.

The square root of 12694591324809 is 3562947.

It is a perfect power (a square), and thus also a powerful number.

12694591324809 is a `hidden beast` number, since 1 + 2 + 6 + 9 + 4 + 591 + 32 + 4 + 8 + 0 + 9 = 666.

It is a tau number, because it is divible by the number of its divisors (27).

It is not a de Polignac number, because 12694591324809 - 2³ = 12694591324801 is a prime.

It is a super-2 number, since 2×12694591324809² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12694591324801) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 288576714 + ... + 288620700.

Almost surely, 2^{12694591324809} is an apocalyptic number.

12694591324809 is the 3562947-th square number.

12694591324809 is the 1781474-th centered octagonal number.

It is an amenable number.

12694591324809 is a deficient number, since it is larger than the sum of its proper divisors (6346761120228).

12694591324809 is an frugal number, since it uses more digits than its factorization.

12694591324809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87998 (or 43990 counting only the distinct ones).

The product of its (nonzero) digits is 33592320, while the sum is 63.

The spelling of 12694591324809 in words is "twelve trillion, six hundred ninety-four billion, five hundred ninety-one million, three hundred twenty-four thousand, eight hundred nine".