1263664663415 has 64 divisors (see below), whose sum is σ = 2018328772608. Its totient is φ = 741400957440.

The previous prime is 1263664663397. The next prime is 1263664663451. The reversal of 1263664663415 is 5143664663621.

It is not a de Polignac number, because 1263664663415 - 2¹⁰ = 1263664662391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 63 ways as a sum of consecutive naturals, for example, 5879 + ... + 1589768.

It is an arithmetic number, because the mean of its divisors is an integer number (31536387072).

Almost surely, 2^{1263664663415} is an apocalyptic number.

1263664663415 is a deficient number, since it is larger than the sum of its proper divisors (754664109193).

1263664663415 is a wasteful number, since it uses less digits than its factorization.

1263664663415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1595709 (or 1595687 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 53.

The spelling of 1263664663415 in words is "one trillion, two hundred sixty-three billion, six hundred sixty-four million, six hundred sixty-three thousand, four hundred fifteen".