13075491778 has 4 divisors (see below), whose sum is σ = 19613237670. Its totient is φ = 6537745888.

The previous prime is 13075491773. The next prime is 13075491799. The reversal of 13075491778 is 87719457031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11832435729 + 1243056049 = 108777^2 + 35257^2 .

It is not an unprimeable number, because it can be changed into a prime (13075491773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3268872943 + ... + 3268872946.

Almost surely, 2^13075491778 is an apocalyptic number.

13075491778 is a deficient number, since it is larger than the sum of its proper divisors (6537745892).

13075491778 is an equidigital number, since it uses as much as digits as its factorization.

13075491778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6537745891.

The product of its (nonzero) digits is 1481760, while the sum is 52.

The spelling of 13075491778 in words is "thirteen billion, seventy-five million, four hundred ninety-one thousand, seven hundred seventy-eight".