51419695920 has 80 divisors (see below), whose sum is σ = 159628970592. Its totient is φ = 13692313600.

The previous prime is 51419695913. The next prime is 51419695937. The reversal of 51419695920 is 2959691415.

It is a tau number, because it is divible by the number of its divisors (80).

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 15 ways as a sum of consecutive naturals, for example, 15424 + ... + 321056.

Almost surely, 2^51419695920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51419695920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79814485296).

51419695920 is an abundant number, since it is smaller than the sum of its proper divisors (108209274672).

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

51419695920 is a wasteful number, since it uses less digits than its factorization.

51419695920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306350 (or 306344 counting only the distinct ones).

The product of its (nonzero) digits is 874800, while the sum is 51.

The spelling of 51419695920 in words is "fifty-one billion, four hundred nineteen million, six hundred ninety-five thousand, nine hundred twenty".