8247718621 has 4 divisors (see below), whose sum is σ = 8363883744. Its totient is φ = 8131553500.

The previous prime is 8247718573. The next prime is 8247718667. The reversal of 8247718621 is 1268177428.

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 8247718621 - 2¹¹ = 8247716573 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 (8247718121) 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, 58082455 + ... + 58082596.

It is an arithmetic number, because the mean of its divisors is an integer number (2090970936).

Almost surely, 2^8247718621 is an apocalyptic number.

It is an amenable number.

8247718621 is a deficient number, since it is larger than the sum of its proper divisors (116165123).

8247718621 is a wasteful number, since it uses less digits than its factorization.

8247718621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116165122.

The product of its digits is 301056, while the sum is 46.

The square root of 8247718621 is about 90816.9511765287. The cubic root of 8247718621 is about 2020.4337385923.

The spelling of 8247718621 in words is "eight billion, two hundred forty-seven million, seven hundred eighteen thousand, six hundred twenty-one".