8263457621 has 4 divisors (see below), whose sum is σ = 8287135500. Its totient is φ = 8239779744.

The previous prime is 8263457593. The next prime is 8263457639. The reversal of 8263457621 is 1267543628.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7104804100 + 1158653521 = 84290^2 + 34039^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8263457621 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 (8263457221) 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, 11838416 + ... + 11839113.

It is an arithmetic number, because the mean of its divisors is an integer number (2071783875).

Almost surely, 2^8263457621 is an apocalyptic number.

It is an amenable number.

8263457621 is a deficient number, since it is larger than the sum of its proper divisors (23677879).

8263457621 is a wasteful number, since it uses less digits than its factorization.

8263457621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23677878.

The product of its digits is 483840, while the sum is 44.

The square root of 8263457621 is about 90903.5622019291. The cubic root of 8263457621 is about 2021.7181099405.

The spelling of 8263457621 in words is "eight billion, two hundred sixty-three million, four hundred fifty-seven thousand, six hundred twenty-one".