12815340341905 has 16 divisors (see below), whose sum is σ = 15431998804560. Its totient is φ = 10216593405952.

The previous prime is 12815340341887. The next prime is 12815340341977. The reversal of 12815340341905 is 50914304351821.

It is a Cunningham number, because it is equal to 3579852²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 2130280364304 + 10685059977601 = 1459548^2 + 3268801^2 .

It is a cyclic number.

It is not a de Polignac number, because 12815340341905 - 2³⁷ = 12677901388433 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 869464 + ... + 5136793.

It is an arithmetic number, because the mean of its divisors is an integer number (964499925285).

Almost surely, 2^{12815340341905} is an apocalyptic number.

It is an amenable number.

12815340341905 is a deficient number, since it is larger than the sum of its proper divisors (2616658462655).

12815340341905 is a wasteful number, since it uses less digits than its factorization.

12815340341905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6007748.

The product of its (nonzero) digits is 518400, while the sum is 46.

The spelling of 12815340341905 in words is "twelve trillion, eight hundred fifteen billion, three hundred forty million, three hundred forty-one thousand, nine hundred five".