815361497441 has 4 divisors (see below), whose sum is σ = 830745676692. Its totient is φ = 799977318192.

The previous prime is 815361497393. The next prime is 815361497491. The reversal of 815361497441 is 144794163518.

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 723173356816 + 92188140625 = 850396^2 + 303625^2 .

It is not a de Polignac number, because 815361497441 - 2¹⁴ = 815361481057 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53), and also a Moran number because the ratio is a prime number: 15384179197 = 815361497441 / (8 + 1 + 5 + 3 + 6 + 1 + 4 + 9 + 7 + 4 + 4 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (815361497491) 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, 7692089546 + ... + 7692089651.

It is an arithmetic number, because the mean of its divisors is an integer number (207686419173).

Almost surely, 2^815361497441 is an apocalyptic number.

It is an amenable number.

815361497441 is a deficient number, since it is larger than the sum of its proper divisors (15384179251).

815361497441 is a wasteful number, since it uses less digits than its factorization.

815361497441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15384179250.

The product of its digits is 2903040, while the sum is 53.

The spelling of 815361497441 in words is "eight hundred fifteen billion, three hundred sixty-one million, four hundred ninety-seven thousand, four hundred forty-one".