7871417781566 has 16 divisors (see below), whose sum is σ = 11859391837440. Its totient is φ = 3918287904600.

The previous prime is 7871417781553. The next prime is 7871417781631. The reversal of 7871417781566 is 6651877141787.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 7871417781496 and 7871417781505.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25076891 + ... + 25388841.

It is an arithmetic number, because the mean of its divisors is an integer number (741211989840).

Almost surely, 2^{7871417781566} is an apocalyptic number.

7871417781566 is a deficient number, since it is larger than the sum of its proper divisors (3987974055874).

7871417781566 is a wasteful number, since it uses less digits than its factorization.

7871417781566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367759.

The product of its digits is 110638080, while the sum is 68.

The spelling of 7871417781566 in words is "seven trillion, eight hundred seventy-one billion, four hundred seventeen million, seven hundred eighty-one thousand, five hundred sixty-six".