8221777077 has 4 divisors (see below), whose sum is σ = 10962369440. Its totient is φ = 5481184716.

The previous prime is 8221777049. The next prime is 8221777129. The reversal of 8221777077 is 7707771228.

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 not a de Polignac number, because 8221777077 - 2⁸ = 8221776821 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 (8221777007) 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, 1370296177 + ... + 1370296182.

It is an arithmetic number, because the mean of its divisors is an integer number (2740592360).

Almost surely, 2^8221777077 is an apocalyptic number.

It is an amenable number.

8221777077 is a deficient number, since it is larger than the sum of its proper divisors (2740592363).

8221777077 is a wasteful number, since it uses less digits than its factorization.

8221777077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2740592362.

The product of its (nonzero) digits is 537824, while the sum is 48.

The square root of 8221777077 is about 90674.0154454406. The cubic root of 8221777077 is about 2018.3132241782.

The spelling of 8221777077 in words is "eight billion, two hundred twenty-one million, seven hundred seventy-seven thousand, seventy-seven".