8126899777 has 4 divisors (see below), whose sum is σ = 8169008260. Its totient is φ = 8084791296.

The previous prime is 8126899769. The next prime is 8126899789. The reversal of 8126899777 is 7779986218.

It is a happy number.

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 4408827201 + 3718072576 = 66399^2 + 60976^2 .

It is a cyclic number.

It is not a de Polignac number, because 8126899777 - 2³ = 8126899769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8126899877) 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, 21053952 + ... + 21054337.

It is an arithmetic number, because the mean of its divisors is an integer number (2042252065).

Almost surely, 2^8126899777 is an apocalyptic number.

It is an amenable number.

8126899777 is a deficient number, since it is larger than the sum of its proper divisors (42108483).

8126899777 is a wasteful number, since it uses less digits than its factorization.

8126899777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42108482.

The product of its digits is 21337344, while the sum is 64.

The square root of 8126899777 is about 90149.3193374193. The cubic root of 8126899777 is about 2010.5195539008.

The spelling of 8126899777 in words is "eight billion, one hundred twenty-six million, eight hundred ninety-nine thousand, seven hundred seventy-seven".