8221557763 has 4 divisors (see below), whose sum is σ = 8230827600. Its totient is φ = 8212287928.

The previous prime is 8221557761. The next prime is 8221557769. The reversal of 8221557763 is 3677551228.

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

It is a cyclic number.

It is not a de Polignac number, because 8221557763 - 2¹ = 8221557761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8221557761) 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, 4633588 + ... + 4635361.

It is an arithmetic number, because the mean of its divisors is an integer number (2057706900).

Almost surely, 2^8221557763 is an apocalyptic number.

8221557763 is a deficient number, since it is larger than the sum of its proper divisors (9269837).

8221557763 is an equidigital number, since it uses as much as digits as its factorization.

8221557763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9269836.

The product of its digits is 705600, while the sum is 46.

The square root of 8221557763 is about 90672.8060831912. The cubic root of 8221557763 is about 2018.2952780060.

The spelling of 8221557763 in words is "eight billion, two hundred twenty-one million, five hundred fifty-seven thousand, seven hundred sixty-three".