51445866240 has 108 divisors (see below), whose sum is σ = 177997378104. Its totient is φ = 13718894592.

The previous prime is 51445866217. The next prime is 51445866257. The reversal of 51445866240 is 4266854415.

It is a happy number.

51445866240 is a `hidden beast` number, since 5 + 1 + 4 + 4 + 586 + 62 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 2221374 + ... + 2244413.

Almost surely, 2^51445866240 is an apocalyptic number.

It is an amenable number.

51445866240 is an abundant number, since it is smaller than the sum of its proper divisors (126551511864).

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

51445866240 is a wasteful number, since it uses less digits than its factorization.

51445866240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4465814 (or 4465797 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 45.

The spelling of 51445866240 in words is "fifty-one billion, four hundred forty-five million, eight hundred sixty-six thousand, two hundred forty".