51421911696 has 75 divisors (see below), whose sum is σ = 148853562451. Its totient is φ = 17137916064.

The previous prime is 51421911691. The next prime is 51421911719. The reversal of 51421911696 is 69611912415.

The square root of 51421911696 is 226764.

It is a perfect power (a square), and thus also a powerful number.

51421911696 is a `hidden beast` number, since 51 + 421 + 91 + 1 + 6 + 96 = 666.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51421911691) by changing a digit.

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 14 ways as a sum of consecutive naturals, for example, 8160355 + ... + 8166653.

Almost surely, 2^51421911696 is an apocalyptic number.

51421911696 is the 226764-th square number.

It is an amenable number.

51421911696 is an abundant number, since it is smaller than the sum of its proper divisors (97431650755).

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

51421911696 is an frugal number, since it uses more digits than its factorization.

51421911696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12618 (or 6304 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The spelling of 51421911696 in words is "fifty-one billion, four hundred twenty-one million, nine hundred eleven thousand, six hundred ninety-six".