1264663613 has 4 divisors (see below), whose sum is σ = 1279900608. Its totient is φ = 1249426620.

The previous prime is 1264663601. The next prime is 1264663619. The reversal of 1264663613 is 3163664621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1264663613 - 2⁴ = 1264663597 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 (1264663619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7618373 + ... + 7618538.

It is an arithmetic number, because the mean of its divisors is an integer number (319975152).

Almost surely, 2^1264663613 is an apocalyptic number.

It is an amenable number.

1264663613 is a deficient number, since it is larger than the sum of its proper divisors (15236995).

1264663613 is an equidigital number, since it uses as much as digits as its factorization.

1264663613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15236994.

The product of its digits is 93312, while the sum is 38.

The square root of 1264663613 is about 35562.1092315965. The cubic root of 1264663613 is about 1081.4132199588.

The spelling of 1264663613 in words is "one billion, two hundred sixty-four million, six hundred sixty-three thousand, six hundred thirteen".