8221623777 has 6 divisors (see below), whose sum is σ = 11875678802. Its totient is φ = 5481082512.

The previous prime is 8221623763. The next prime is 8221623811. The reversal of 8221623777 is 7773261228.

It can be written as a sum of positive squares in only one way, i.e., 5666927841 + 2554695936 = 75279^2 + 50544^2 .

It is not a de Polignac number, because 8221623777 - 2⁶ = 8221623713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8221623757) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 456756868 + ... + 456756885.

Almost surely, 2^8221623777 is an apocalyptic number.

It is an amenable number.

8221623777 is a deficient number, since it is larger than the sum of its proper divisors (3654055025).

8221623777 is a wasteful number, since it uses less digits than its factorization.

8221623777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913513759 (or 913513756 counting only the distinct ones).

The product of its digits is 395136, while the sum is 45.

The square root of 8221623777 is about 90673.1701056051. The cubic root of 8221623777 is about 2018.3006798772.

The spelling of 8221623777 in words is "eight billion, two hundred twenty-one million, six hundred twenty-three thousand, seven hundred seventy-seven".