15820537053749 has 2 divisors, whose sum is σ = 15820537053750. Its totient is φ = 15820537053748.

The previous prime is 15820537053719. The next prime is 15820537053787. The reversal of 15820537053749 is 94735073502851.

15820537053749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9972603991249 + 5847933062500 = 3157943^2 + 2418250^2 .

It is an emirp because it is prime and its reverse (94735073502851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15820537053749 - 2¹⁶ = 15820536988213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15820537053719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7910268526874 + 7910268526875.

It is an arithmetic number, because the mean of its divisors is an integer number (7910268526875).

Almost surely, 2^{15820537053749} is an apocalyptic number.

It is an amenable number.

15820537053749 is a deficient number, since it is larger than the sum of its proper divisors (1).

15820537053749 is an equidigital number, since it uses as much as digits as its factorization.

15820537053749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752000, while the sum is 59.

The spelling of 15820537053749 in words is "fifteen trillion, eight hundred twenty billion, five hundred thirty-seven million, fifty-three thousand, seven hundred forty-nine".