7881071668 has 12 divisors (see below), whose sum is σ = 14267457540. Its totient is φ = 3804655232.

The previous prime is 7881071659. The next prime is 7881071683. The reversal of 7881071668 is 8661701887.

It can be written as a sum of positive squares in 2 ways, for example, as 2937856804 + 4943214864 = 54202^2 + 70308^2 .

It is a super-2 number, since 2×7881071668² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33970021 + ... + 33970252.

It is an arithmetic number, because the mean of its divisors is an integer number (1188954795).

Almost surely, 2^7881071668 is an apocalyptic number.

It is an amenable number.

7881071668 is a deficient number, since it is larger than the sum of its proper divisors (6386385872).

7881071668 is a wasteful number, since it uses less digits than its factorization.

7881071668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67940306 (or 67940304 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 52.

The square root of 7881071668 is about 88775.4001286392. The cubic root of 7881071668 is about 1990.0397850686.

The spelling of 7881071668 in words is "seven billion, eight hundred eighty-one million, seventy-one thousand, six hundred sixty-eight".