1264163653 has 4 divisors (see below), whose sum is σ = 1291060800. Its totient is φ = 1237266508.

The previous prime is 1264163647. The next prime is 1264163669. The reversal of 1264163653 is 3563614621.

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 1264163653 - 2⁹ = 1264163141 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 (1264161653) 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, 13448503 + ... + 13448596.

It is an arithmetic number, because the mean of its divisors is an integer number (322765200).

Almost surely, 2^1264163653 is an apocalyptic number.

It is an amenable number.

1264163653 is a deficient number, since it is larger than the sum of its proper divisors (26897147).

1264163653 is an equidigital number, since it uses as much as digits as its factorization.

1264163653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26897146.

The product of its digits is 77760, while the sum is 37.

The square root of 1264163653 is about 35555.0791448986. The cubic root of 1264163653 is about 1081.2706959942.

The spelling of 1264163653 in words is "one billion, two hundred sixty-four million, one hundred sixty-three thousand, six hundred fifty-three".