7866868681 has 4 divisors (see below), whose sum is σ = 8990707072. Its totient is φ = 6743030292.

The previous prime is 7866868637. The next prime is 7866868739. The reversal of 7866868681 is 1868686687.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7866868681 is a prime.

It is a super-2 number, since 2×7866868681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7866868621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 561919185 + ... + 561919198.

It is an arithmetic number, because the mean of its divisors is an integer number (2247676768).

Almost surely, 2^7866868681 is an apocalyptic number.

It is an amenable number.

7866868681 is a deficient number, since it is larger than the sum of its proper divisors (1123838391).

7866868681 is a wasteful number, since it uses less digits than its factorization.

7866868681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123838390.

The product of its digits is 37158912, while the sum is 64.

The square root of 7866868681 is about 88695.3701215571. The cubic root of 7866868681 is about 1988.8436065747.

The spelling of 7866868681 in words is "seven billion, eight hundred sixty-six million, eight hundred sixty-eight thousand, six hundred eighty-one".