13778359849 has 4 divisors (see below), whose sum is σ = 13877484880. Its totient is φ = 13679234820.

The previous prime is 13778359843. The next prime is 13778359873. The reversal of 13778359849 is 94895387731.

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 13778359849 - 2⁵ = 13778359817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13778359843) 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, 49562307 + ... + 49562584.

It is an arithmetic number, because the mean of its divisors is an integer number (3469371220).

Almost surely, 2^13778359849 is an apocalyptic number.

It is an amenable number.

13778359849 is a deficient number, since it is larger than the sum of its proper divisors (99125031).

13778359849 is an equidigital number, since it uses as much as digits as its factorization.

13778359849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99125030.

The product of its digits is 45722880, while the sum is 64.

It can be divided in two parts, 1377835 and 9849, that added together give a square (1387684 = 1178²).

The spelling of 13778359849 in words is "thirteen billion, seven hundred seventy-eight million, three hundred fifty-nine thousand, eight hundred forty-nine".