8078126661 has 24 divisors (see below), whose sum is σ = 13139792640. Its totient is φ = 4737902400.

The previous prime is 8078126653. The next prime is 8078126681. The reversal of 8078126661 is 1666218708.

It is a happy number.

It is not a de Polignac number, because 8078126661 - 2³ = 8078126653 is a prime.

It is a super-2 number, since 2×8078126661² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8078126681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1313016 + ... + 1319153.

It is an arithmetic number, because the mean of its divisors is an integer number (547491360).

Almost surely, 2^8078126661 is an apocalyptic number.

It is an amenable number.

8078126661 is a deficient number, since it is larger than the sum of its proper divisors (5061665979).

8078126661 is a wasteful number, since it uses less digits than its factorization.

8078126661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2632217 (or 2632214 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 8078126661 is about 89878.3993015007. The cubic root of 8078126661 is about 2006.4894756617.

The spelling of 8078126661 in words is "eight billion, seventy-eight million, one hundred twenty-six thousand, six hundred sixty-one".