13399280641 has 4 divisors (see below), whose sum is σ = 13467297492. Its totient is φ = 13331263792.

The previous prime is 13399280633. The next prime is 13399280647. The reversal of 13399280641 is 14608299331.

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: 14608299331 = 55333 ⋅264007.

It can be written as a sum of positive squares in 2 ways, for example, as 7804839025 + 5594441616 = 88345^2 + 74796^2 .

It is a cyclic number.

It is not a de Polignac number, because 13399280641 - 2³ = 13399280633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13399280591 and 13399280600.

It is not an unprimeable number, because it can be changed into a prime (13399280647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34008130 + ... + 34008523.

It is an arithmetic number, because the mean of its divisors is an integer number (3366824373).

Almost surely, 2^13399280641 is an apocalyptic number.

It is an amenable number.

13399280641 is a deficient number, since it is larger than the sum of its proper divisors (68016851).

13399280641 is an equidigital number, since it uses as much as digits as its factorization.

13399280641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68016850.

The product of its (nonzero) digits is 279936, while the sum is 46.

The spelling of 13399280641 in words is "thirteen billion, three hundred ninety-nine million, two hundred eighty thousand, six hundred forty-one".