1263311643455 has 16 divisors (see below), whose sum is σ = 1606472331264. Its totient is φ = 950415106560.

The previous prime is 1263311643449. The next prime is 1263311643457. The reversal of 1263311643455 is 5543461133621.

It is a happy number.

It is not a de Polignac number, because 1263311643455 - 2⁸ = 1263311643199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263311643457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6023231 + ... + 6229440.

It is an arithmetic number, because the mean of its divisors is an integer number (100404520704).

Almost surely, 2^{1263311643455} is an apocalyptic number.

1263311643455 is a deficient number, since it is larger than the sum of its proper divisors (343160687809).

1263311643455 is a wasteful number, since it uses less digits than its factorization.

1263311643455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12253906.

The product of its digits is 777600, while the sum is 44.

The spelling of 1263311643455 in words is "one trillion, two hundred sixty-three billion, three hundred eleven million, six hundred forty-three thousand, four hundred fifty-five".