50005218666 has 256 divisors, whose sum is σ = 122553446400. Its totient is φ = 13450364928.

The previous prime is 50005218631. The next prime is 50005218671. The reversal of 50005218666 is 66681250005.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 159760926 + ... + 159761238.

It is an arithmetic number, because the mean of its divisors is an integer number (478724400).

Almost surely, 2^50005218666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 50005218666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61276723200).

50005218666 is an abundant number, since it is smaller than the sum of its proper divisors (72548227734).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

50005218666 is a wasteful number, since it uses less digits than its factorization.

50005218666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525.

The product of its (nonzero) digits is 86400, while the sum is 39.

The spelling of 50005218666 in words is "fifty billion, five million, two hundred eighteen thousand, six hundred sixty-six".