3813645518497 has 4 divisors (see below), whose sum is σ = 3813719821636. Its totient is φ = 3813571215360.

The previous prime is 3813645518471. The next prime is 3813645518587. The reversal of 3813645518497 is 7948155463183.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2044096418961 + 1769549099536 = 1429719^2 + 1330244^2 .

It is a cyclic number.

It is not a de Polignac number, because 3813645518497 - 2¹⁹ = 3813644994209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3813645518447) 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, 37074528 + ... + 37177249.

It is an arithmetic number, because the mean of its divisors is an integer number (953429955409).

Almost surely, 2^{3813645518497} is an apocalyptic number.

It is an amenable number.

3813645518497 is a deficient number, since it is larger than the sum of its proper divisors (74303139).

3813645518497 is an equidigital number, since it uses as much as digits as its factorization.

3813645518497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74303138.

The product of its digits is 87091200, while the sum is 64.

The spelling of 3813645518497 in words is "three trillion, eight hundred thirteen billion, six hundred forty-five million, five hundred eighteen thousand, four hundred ninety-seven".