13120442757 has 18 divisors (see below), whose sum is σ = 19467061458. Its totient is φ = 8509201632.

The previous prime is 13120442737. The next prime is 13120442773. The reversal of 13120442757 is 75724402131.

It can be written as a sum of positive squares in 3 ways, for example, as 11847451716 + 1272991041 = 108846^2 + 35679^2 .

It is not a de Polignac number, because 13120442757 - 2⁸ = 13120442501 is a prime.

It is a super-2 number, since 2×13120442757² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13120442707) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2087103 + ... + 2093379.

Almost surely, 2^13120442757 is an apocalyptic number.

It is an amenable number.

13120442757 is a deficient number, since it is larger than the sum of its proper divisors (6346618701).

13120442757 is an frugal number, since it uses more digits than its factorization.

13120442757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12597 (or 6317 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

Adding to 13120442757 its reverse (75724402131), we get a palindrome (88844844888).

The spelling of 13120442757 in words is "thirteen billion, one hundred twenty million, four hundred forty-two thousand, seven hundred fifty-seven".