6665751081 has 24 divisors (see below), whose sum is σ = 10747884576. Its totient is φ = 3945896640.

The previous prime is 6665751061. The next prime is 6665751089. The reversal of 6665751081 is 1801575666.

6665751081 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6665751081 - 2⁷ = 6665750953 is a prime.

It is a super-2 number, since 2×6665751081² = 88864474947705337122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6665751089) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 778660 + ... + 787173.

It is an arithmetic number, because the mean of its divisors is an integer number (447828524).

Almost surely, 2^6665751081 is an apocalyptic number.

It is an amenable number.

6665751081 is a deficient number, since it is larger than the sum of its proper divisors (4082133495).

6665751081 is a wasteful number, since it uses less digits than its factorization.

6665751081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565893 (or 1565890 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The square root of 6665751081 is about 81644.0511060053. The cubic root of 6665751081 is about 1881.9858939074.

The spelling of 6665751081 in words is "six billion, six hundred sixty-five million, seven hundred fifty-one thousand, eighty-one".