51781822986 has 16 divisors (see below), whose sum is σ = 103574345184. Its totient is φ = 17258824464.

The previous prime is 51781822951. The next prime is 51781822991. The reversal of 51781822986 is 68922818715.

51781822986 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 382185 + ... + 499628.

It is an arithmetic number, because the mean of its divisors is an integer number (6473396574).

Almost surely, 2^51781822986 is an apocalyptic number.

51781822986 is an abundant number, since it is smaller than the sum of its proper divisors (51792522198).

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

51781822986 is a wasteful number, since it uses less digits than its factorization.

51781822986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891605.

The product of its digits is 3870720, while the sum is 57.

The spelling of 51781822986 in words is "fifty-one billion, seven hundred eighty-one million, eight hundred twenty-two thousand, nine hundred eighty-six".