13855178749 has 4 divisors (see below), whose sum is σ = 14193109980. Its totient is φ = 13517247520.

The previous prime is 13855178747. The next prime is 13855178783. The reversal of 13855178749 is 94787155831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94787155831 = 264793 ⋅357967.

It can be written as a sum of positive squares in 2 ways, for example, as 548402724 + 13306776025 = 23418^2 + 115355^2 .

It is a cyclic number.

It is not a de Polignac number, because 13855178749 - 2¹ = 13855178747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13855178693 and 13855178702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13855178741) 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, 168965554 + ... + 168965635.

It is an arithmetic number, because the mean of its divisors is an integer number (3548277495).

Almost surely, 2^13855178749 is an apocalyptic number.

It is an amenable number.

13855178749 is a deficient number, since it is larger than the sum of its proper divisors (337931231).

13855178749 is an equidigital number, since it uses as much as digits as its factorization.

13855178749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337931230.

The product of its digits is 8467200, while the sum is 58.

The spelling of 13855178749 in words is "thirteen billion, eight hundred fifty-five million, one hundred seventy-eight thousand, seven hundred forty-nine".