51281980484 has 24 divisors (see below), whose sum is σ = 102993112320. Its totient is φ = 21886030656.

The previous prime is 51281980433. The next prime is 51281980487. The reversal of 51281980484 is 48408918215.

It is a super-2 number, since 2×51281980484² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51281980487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3824897 + ... + 3838280.

It is an arithmetic number, because the mean of its divisors is an integer number (4291379680).

Almost surely, 2^51281980484 is an apocalyptic number.

It is an amenable number.

51281980484 is an abundant number, since it is smaller than the sum of its proper divisors (51711131836).

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

51281980484 is a wasteful number, since it uses less digits than its factorization.

51281980484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7663427 (or 7663425 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 50.

The spelling of 51281980484 in words is "fifty-one billion, two hundred eighty-one million, nine hundred eighty thousand, four hundred eighty-four".