51802209666 has 16 divisors (see below), whose sum is σ = 115116021600. Its totient is φ = 17267403204.

The previous prime is 51802209659. The next prime is 51802209671. The reversal of 51802209666 is 66690220815.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 479650036 + ... + 479650143.

It is an arithmetic number, because the mean of its divisors is an integer number (7194751350).

Almost surely, 2^51802209666 is an apocalyptic number.

51802209666 is an abundant number, since it is smaller than the sum of its proper divisors (63313811934).

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

51802209666 is a wasteful number, since it uses less digits than its factorization.

51802209666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959300190 (or 959300184 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 51802209666 in words is "fifty-one billion, eight hundred two million, two hundred nine thousand, six hundred sixty-six".