1263864663 has 6 divisors (see below), whose sum is σ = 1825582304. Its totient is φ = 842576436.

The previous prime is 1263864619. The next prime is 1263864709. The reversal of 1263864663 is 3664683621.

1263864663 is a `hidden beast` number, since 1 + 2 + 638 + 6 + 4 + 6 + 6 + 3 = 666.

It is not a de Polignac number, because 1263864663 - 2⁶ = 1263864599 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 (1263864163) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 70214695 + ... + 70214712.

Almost surely, 2^1263864663 is an apocalyptic number.

1263864663 is a deficient number, since it is larger than the sum of its proper divisors (561717641).

1263864663 is a wasteful number, since it uses less digits than its factorization.

1263864663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140429413 (or 140429410 counting only the distinct ones).

The product of its digits is 746496, while the sum is 45.

The square root of 1263864663 is about 35550.8742930466. The cubic root of 1263864663 is about 1081.1854447386.

The spelling of 1263864663 in words is "one billion, two hundred sixty-three million, eight hundred sixty-four thousand, six hundred sixty-three".