1815385084697 has 2 divisors, whose sum is σ = 1815385084698. Its totient is φ = 1815385084696.

The previous prime is 1815385084613. The next prime is 1815385084763. The reversal of 1815385084697 is 7964805835181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1440729692416 + 374655392281 = 1200304^2 + 612091^2 .

It is a cyclic number.

It is not a de Polignac number, because 1815385084697 - 2⁸ = 1815385084441 is a prime.

It is not a weakly prime, because it can be changed into another prime (1815385074697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 907692542348 + 907692542349.

It is an arithmetic number, because the mean of its divisors is an integer number (907692542349).

Almost surely, 2^{1815385084697} is an apocalyptic number.

It is an amenable number.

1815385084697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1815385084697 is an equidigital number, since it uses as much as digits as its factorization.

1815385084697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58060800, while the sum is 65.

The spelling of 1815385084697 in words is "one trillion, eight hundred fifteen billion, three hundred eighty-five million, eighty-four thousand, six hundred ninety-seven".