51439419966 has 16 divisors (see below), whose sum is σ = 112231461888. Its totient is φ = 15587703000.

The previous prime is 51439419953. The next prime is 51439419971. The reversal of 51439419966 is 66991493415.

It is a happy number.

It is a congruent number.

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, 389692510 + ... + 389692641.

It is an arithmetic number, because the mean of its divisors is an integer number (7014466368).

Almost surely, 2^51439419966 is an apocalyptic number.

51439419966 is an abundant number, since it is smaller than the sum of its proper divisors (60792041922).

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

51439419966 is a wasteful number, since it uses less digits than its factorization.

51439419966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779385167.

The product of its digits is 6298560, while the sum is 57.

The spelling of 51439419966 in words is "fifty-one billion, four hundred thirty-nine million, four hundred nineteen thousand, nine hundred sixty-six".