7811878822166 has 8 divisors (see below), whose sum is σ = 11787984810000. Its totient is φ = 3882550552168.

The previous prime is 7811878822159. The next prime is 7811878822177. The reversal of 7811878822166 is 6612288781187.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×7811878822166² (a number of 27 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, 11694429041 + ... + 11694429708.

It is an arithmetic number, because the mean of its divisors is an integer number (1473498101250).

Almost surely, 2^{7811878822166} is an apocalyptic number.

7811878822166 is a deficient number, since it is larger than the sum of its proper divisors (3976105987834).

7811878822166 is a wasteful number, since it uses less digits than its factorization.

7811878822166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23388858918.

The product of its digits is 28901376, while the sum is 65.

The spelling of 7811878822166 in words is "seven trillion, eight hundred eleven billion, eight hundred seventy-eight million, eight hundred twenty-two thousand, one hundred sixty-six".