47820581666 has 32 divisors (see below), whose sum is σ = 84396791808. Its totient is φ = 20034685440.

The previous prime is 47820581663. The next prime is 47820581707. The reversal of 47820581666 is 66618502874.

It is a happy number.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (47820581663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68255 + ... + 316701.

It is an arithmetic number, because the mean of its divisors is an integer number (2637399744).

Almost surely, 2^47820581666 is an apocalyptic number.

47820581666 is a deficient number, since it is larger than the sum of its proper divisors (36576210142).

47820581666 is a wasteful number, since it uses less digits than its factorization.

47820581666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249146.

The product of its (nonzero) digits is 3870720, while the sum is 53.

The spelling of 47820581666 in words is "forty-seven billion, eight hundred twenty million, five hundred eighty-one thousand, six hundred sixty-six".