8081510661 has 36 divisors (see below), whose sum is σ = 13596766092. Its totient is φ = 4612011264.

The previous prime is 8081510639. The next prime is 8081510669. The reversal of 8081510661 is 1660151808.

8081510661 is a `hidden beast` number, since 8 + 0 + 81 + 510 + 6 + 61 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5356044225 + 2725466436 = 73185^2 + 52206^2 .

It is not a de Polignac number, because 8081510661 - 2⁵ = 8081510629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8081510669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 339981 + ... + 362973.

It is an arithmetic number, because the mean of its divisors is an integer number (377687947).

Almost surely, 2^8081510661 is an apocalyptic number.

It is an amenable number.

8081510661 is a deficient number, since it is larger than the sum of its proper divisors (5515255431).

8081510661 is a wasteful number, since it uses less digits than its factorization.

8081510661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23810 (or 23800 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 8081510661 is about 89897.2227657785. Note that the first 3 decimals coincide. The cubic root of 8081510661 is about 2006.7696153841.

The spelling of 8081510661 in words is "eight billion, eighty-one million, five hundred ten thousand, six hundred sixty-one".