51921847866 has 16 divisors (see below), whose sum is σ = 118678509504. Its totient is φ = 14834813664.

The previous prime is 51921847837. The next prime is 51921847877. The reversal of 51921847866 is 66874812915.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 618117195 + ... + 618117278.

It is an arithmetic number, because the mean of its divisors is an integer number (7417406844).

Almost surely, 2^51921847866 is an apocalyptic number.

51921847866 is an abundant number, since it is smaller than the sum of its proper divisors (66756661638).

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

51921847866 is a wasteful number, since it uses less digits than its factorization.

51921847866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236234485.

The product of its digits is 5806080, while the sum is 57.

The spelling of 51921847866 in words is "fifty-one billion, nine hundred twenty-one million, eight hundred forty-seven thousand, eight hundred sixty-six".