13061798749 has 4 divisors (see below), whose sum is σ = 13308247836. Its totient is φ = 12815349664.

The previous prime is 13061798747. The next prime is 13061798777. The reversal of 13061798749 is 94789716031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94789716031 = 61 ⋅1553929771.

It can be written as a sum of positive squares in 2 ways, for example, as 3591005625 + 9470793124 = 59925^2 + 97318^2 .

It is a cyclic number.

It is not a de Polignac number, because 13061798749 - 2¹ = 13061798747 is a prime.

It is a super-2 number, since 2×13061798749² (a number of 21 digits) contains 22 as substring.

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 13061798749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13061798747) 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, 123224464 + ... + 123224569.

It is an arithmetic number, because the mean of its divisors is an integer number (3327061959).

Almost surely, 2^13061798749 is an apocalyptic number.

It is an amenable number.

13061798749 is a deficient number, since it is larger than the sum of its proper divisors (246449087).

13061798749 is an equidigital number, since it uses as much as digits as its factorization.

13061798749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246449086.

The product of its (nonzero) digits is 2286144, while the sum is 55.

The spelling of 13061798749 in words is "thirteen billion, sixty-one million, seven hundred ninety-eight thousand, seven hundred forty-nine".