815671300049 has 2 divisors, whose sum is σ = 815671300050. Its totient is φ = 815671300048.

The previous prime is 815671300021. The next prime is 815671300267. The reversal of 815671300049 is 940003176518.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 553583617024 + 262087683025 = 744032^2 + 511945^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-815671300049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 815671299982 and 815671300009.

It is not a weakly prime, because it can be changed into another prime (815671300009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407835650024 + 407835650025.

It is an arithmetic number, because the mean of its divisors is an integer number (407835650025).

Almost surely, 2^815671300049 is an apocalyptic number.

It is an amenable number.

815671300049 is a deficient number, since it is larger than the sum of its proper divisors (1).

815671300049 is an equidigital number, since it uses as much as digits as its factorization.

815671300049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 815671300049 in words is "eight hundred fifteen billion, six hundred seventy-one million, three hundred thousand, forty-nine".