13445567749 has 4 divisors (see below), whose sum is σ = 13499136000. Its totient is φ = 13391999500.

The previous prime is 13445567701. The next prime is 13445567791. The reversal of 13445567749 is 94776554431.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13445567749 - 2²¹ = 13443470597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13445567749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13445568749) 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, 26783749 + ... + 26784250.

It is an arithmetic number, because the mean of its divisors is an integer number (3374784000).

Almost surely, 2^13445567749 is an apocalyptic number.

It is an amenable number.

13445567749 is a deficient number, since it is larger than the sum of its proper divisors (53568251).

13445567749 is an equidigital number, since it uses as much as digits as its factorization.

13445567749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53568250.

The product of its digits is 12700800, while the sum is 55.

The spelling of 13445567749 in words is "thirteen billion, four hundred forty-five million, five hundred sixty-seven thousand, seven hundred forty-nine".