1265653301849 has 2 divisors, whose sum is σ = 1265653301850. Its totient is φ = 1265653301848.

The previous prime is 1265653301839. The next prime is 1265653301873. The reversal of 1265653301849 is 9481033565621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 680592000400 + 585061301449 = 824980^2 + 764893^2 .

It is an emirp because it is prime and its reverse (9481033565621) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1265653301849 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1265653301849.

It is not a weakly prime, because it can be changed into another prime (1265653301839) 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, 632826650924 + 632826650925.

It is an arithmetic number, because the mean of its divisors is an integer number (632826650925).

Almost surely, 2^{1265653301849} is an apocalyptic number.

It is an amenable number.

1265653301849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265653301849 is an equidigital number, since it uses as much as digits as its factorization.

1265653301849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4665600, while the sum is 53.

The spelling of 1265653301849 in words is "one trillion, two hundred sixty-five billion, six hundred fifty-three million, three hundred one thousand, eight hundred forty-nine".