7138578861866 has 8 divisors (see below), whose sum is σ = 10707901707360. Its totient is φ = 3569278292748.

The previous prime is 7138578861859. The next prime is 7138578861877. The reversal of 7138578861866 is 6681688758317.

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

It is a junction number, because it is equal to n+sod(n) for n = 7138578861793 and 7138578861802.

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, 4743476 + ... + 6064463.

It is an arithmetic number, because the mean of its divisors is an integer number (1338487713420).

Almost surely, 2^{7138578861866} is an apocalyptic number.

7138578861866 is a deficient number, since it is larger than the sum of its proper divisors (3569322845494).

7138578861866 is a wasteful number, since it uses less digits than its factorization.

7138578861866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11138188.

The product of its digits is 650280960, while the sum is 74.

The spelling of 7138578861866 in words is "seven trillion, one hundred thirty-eight billion, five hundred seventy-eight million, eight hundred sixty-one thousand, eight hundred sixty-six".