51454532240 has 20 divisors (see below), whose sum is σ = 119631787644. Its totient is φ = 20581812864.

The previous prime is 51454532197. The next prime is 51454532323. The reversal of 51454532240 is 4223545415.

It can be written as a sum of positive squares in 2 ways, for example, as 40108873984 + 11345658256 = 200272^2 + 106516^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 51454532240.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321590747 + ... + 321590906.

Almost surely, 2^51454532240 is an apocalyptic number.

It is an amenable number.

51454532240 is an abundant number, since it is smaller than the sum of its proper divisors (68177255404).

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

51454532240 is a wasteful number, since it uses less digits than its factorization.

51454532240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643181666 (or 643181660 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 35.

The spelling of 51454532240 in words is "fifty-one billion, four hundred fifty-four million, five hundred thirty-two thousand, two hundred forty".