7661000581 has 32 divisors (see below), whose sum is σ = 9101030400. Its totient is φ = 6381296640.

The previous prime is 7661000569. The next prime is 7661000597. The reversal of 7661000581 is 1850001667.

7661000581 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 7661000581 - 2⁹ = 7661000069 is a prime.

It is a super-2 number, since 2×7661000581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7661000521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 741630 + ... + 751888.

It is an arithmetic number, because the mean of its divisors is an integer number (284407200).

Almost surely, 2^7661000581 is an apocalyptic number.

It is an amenable number.

7661000581 is a deficient number, since it is larger than the sum of its proper divisors (1440029819).

7661000581 is a wasteful number, since it uses less digits than its factorization.

7661000581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10429.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 7661000581 is about 87527.1419675063. The cubic root of 7661000581 is about 1971.3413508194.

The spelling of 7661000581 in words is "seven billion, six hundred sixty-one million, five hundred eighty-one", and thus it is an aban number.