51445497856 has 57 divisors (see below), whose sum is σ = 103123582891. Its totient is φ = 25664684032.

The previous prime is 51445497833. The next prime is 51445497899. The reversal of 51445497856 is 65879454415.

The square root of 51445497856 is 226816.

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

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51445497856.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 116129571 + ... + 116130013.

Almost surely, 2^51445497856 is an apocalyptic number.

51445497856 is the 226816-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51445497856

51445497856 is an abundant number, since it is smaller than the sum of its proper divisors (51678085035).

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

51445497856 is an frugal number, since it uses more digits than its factorization.

51445497856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922 (or 445 counting only the distinct ones).

The product of its digits is 24192000, while the sum is 58.

The spelling of 51445497856 in words is "fifty-one billion, four hundred forty-five million, four hundred ninety-seven thousand, eight hundred fifty-six".