815745307249 has 4 divisors (see below), whose sum is σ = 820016225280. Its totient is φ = 811474389220.

The previous prime is 815745307243. The next prime is 815745307259. The reversal of 815745307249 is 942703547518.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 815745307249 - 2⁷ = 815745307121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 815745307249.

It is not an unprimeable number, because it can be changed into a prime (815745307243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2135458729 + ... + 2135459110.

It is an arithmetic number, because the mean of its divisors is an integer number (205004056320).

Almost surely, 2^815745307249 is an apocalyptic number.

It is an amenable number.

815745307249 is a deficient number, since it is larger than the sum of its proper divisors (4270918031).

815745307249 is a wasteful number, since it uses less digits than its factorization.

815745307249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4270918030.

The product of its (nonzero) digits is 8467200, while the sum is 55.

The spelling of 815745307249 in words is "eight hundred fifteen billion, seven hundred forty-five million, three hundred seven thousand, two hundred forty-nine".