47878188821666 has 8 divisors (see below), whose sum is σ = 82076895122880. Its totient is φ = 20519223780708.

The previous prime is 47878188821651. The next prime is 47878188821677. The reversal of 47878188821666 is 66612888187874.

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

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, 1709935315046 + ... + 1709935315073.

It is an arithmetic number, because the mean of its divisors is an integer number (10259611890360).

Almost surely, 2^{47878188821666} is an apocalyptic number.

47878188821666 is a deficient number, since it is larger than the sum of its proper divisors (34198706301214).

47878188821666 is a wasteful number, since it uses less digits than its factorization.

47878188821666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3419870630128.

The product of its digits is 2774532096, while the sum is 80.

The spelling of 47878188821666 in words is "forty-seven trillion, eight hundred seventy-eight billion, one hundred eighty-eight million, eight hundred twenty-one thousand, six hundred sixty-six".