51394703616 has 81 divisors (see below), whose sum is σ = 148214982279. Its totient is φ = 17127940608.

The previous prime is 51394703609. The next prime is 51394703683. The reversal of 51394703616 is 61630749315.

It is a happy number.

The square root of 51394703616 is 226704.

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

51394703616 is a `hidden beast` number, since 5 + 139 + 470 + 36 + 16 = 666.

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 8 ways as a sum of consecutive naturals, for example, 10879431 + ... + 10884153.

Almost surely, 2^51394703616 is an apocalyptic number.

51394703616 is the 226704-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51394703616

51394703616 is an abundant number, since it is smaller than the sum of its proper divisors (96820278663).

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

51394703616 is an frugal number, since it uses more digits than its factorization.

51394703616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9468 (or 4728 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The spelling of 51394703616 in words is "fifty-one billion, three hundred ninety-four million, seven hundred three thousand, six hundred sixteen".