51249845856 has 96 divisors (see below), whose sum is σ = 151821734400. Its totient is φ = 14994721280.

The previous prime is 51249845851. The next prime is 51249845861. The reversal of 51249845856 is 65854894215.

It is an interprime number because it is at equal distance from previous prime (51249845851) and next prime (51249845861).

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 51249845796 and 51249845805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51249845851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 806136 + ... + 867383.

It is an arithmetic number, because the mean of its divisors is an integer number (1581476400).

Almost surely, 2^51249845856 is an apocalyptic number.

It is an amenable number.

51249845856 is an abundant number, since it is smaller than the sum of its proper divisors (100571888544).

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

51249845856 is a wasteful number, since it uses less digits than its factorization.

51249845856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1673572 (or 1673564 counting only the distinct ones).

The product of its digits is 13824000, while the sum is 57.

The spelling of 51249845856 in words is "fifty-one billion, two hundred forty-nine million, eight hundred forty-five thousand, eight hundred fifty-six".