7081661807 has 4 divisors (see below), whose sum is σ = 7725449256. Its totient is φ = 6437874360.

The previous prime is 7081661791. The next prime is 7081661863.

7081661807 is nontrivially palindromic in base 10.

7081661807 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7081661807 - 2⁴ = 7081661791 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 (7081661707) 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, 321893708 + ... + 321893729.

It is an arithmetic number, because the mean of its divisors is an integer number (1931362314).

Almost surely, 2^7081661807 is an apocalyptic number.

7081661807 is a deficient number, since it is larger than the sum of its proper divisors (643787449).

7081661807 is a wasteful number, since it uses less digits than its factorization.

7081661807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643787448.

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 7081661807 is about 84152.6102209551. The cubic root of 7081661807 is about 1920.3411762595.

The spelling of 7081661807 in words is "seven billion, eighty-one million, six hundred sixty-one thousand, eight hundred seven".