51489447138240 has 56 divisors (see below), whose sum is σ = 163478994666960. Its totient is φ = 13730519236608.

The previous prime is 51489447138229. The next prime is 51489447138251. The reversal of 51489447138240 is 4283174498415.

It is a happy number.

51489447138240 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51489447138229) and next prime (51489447138251).

It is a super-2 number, since 2×51489447138240² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26817419425 + ... + 26817421344.

It is an arithmetic number, because the mean of its divisors is an integer number (2919267761910).

Almost surely, 2^{51489447138240} is an apocalyptic number.

It is an amenable number.

51489447138240 is an abundant number, since it is smaller than the sum of its proper divisors (111989547528720).

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

51489447138240 is a wasteful number, since it uses less digits than its factorization.

51489447138240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53634840789 (or 53634840779 counting only the distinct ones).

The product of its (nonzero) digits is 30965760, while the sum is 60.

The spelling of 51489447138240 in words is "fifty-one trillion, four hundred eighty-nine billion, four hundred forty-seven million, one hundred thirty-eight thousand, two hundred forty".