13503193891738 has 4 divisors (see below), whose sum is σ = 20254790837610. Its totient is φ = 6751596945868.

The previous prime is 13503193891729. The next prime is 13503193891771. The reversal of 13503193891738 is 83719839130531.

13503193891738 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 10816817165449 + 2686376726289 = 3288893^2 + 1639017^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3375798472933 + ... + 3375798472936.

Almost surely, 2^{13503193891738} is an apocalyptic number.

13503193891738 is a deficient number, since it is larger than the sum of its proper divisors (6751596945872).

13503193891738 is an equidigital number, since it uses as much as digits as its factorization.

13503193891738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6751596945871.

The product of its (nonzero) digits is 14696640, while the sum is 61.

The spelling of 13503193891738 in words is "thirteen trillion, five hundred three billion, one hundred ninety-three million, eight hundred ninety-one thousand, seven hundred thirty-eight".