1263221663 has 16 divisors (see below), whose sum is σ = 1465122816. Its totient is φ = 1077716640.

The previous prime is 1263221657. The next prime is 1263221681. The reversal of 1263221663 is 3661223621.

It is not a de Polignac number, because 1263221663 - 2⁴ = 1263221647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263221693) 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 in 15 ways as a sum of consecutive naturals, for example, 33695 + ... + 60512.

It is an arithmetic number, because the mean of its divisors is an integer number (91570176).

Almost surely, 2^1263221663 is an apocalyptic number.

1263221663 is a deficient number, since it is larger than the sum of its proper divisors (201901153).

1263221663 is a wasteful number, since it uses less digits than its factorization.

1263221663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94294.

The product of its digits is 15552, while the sum is 32.

The square root of 1263221663 is about 35541.8297643776. The cubic root of 1263221663 is about 1081.0020600797.

The spelling of 1263221663 in words is "one billion, two hundred sixty-three million, two hundred twenty-one thousand, six hundred sixty-three".