51438621027872 has 24 divisors (see below), whose sum is σ = 109059768622476. Its totient is φ = 23740902012672.

The previous prime is 51438621027853. The next prime is 51438621027917. The reversal of 51438621027872 is 27872012683415.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 51240457163536 + 198163864336 = 7158244^2 + 445156^2 .

It is a super-3 number, since 3×51438621027872³ (a number of 42 digits) contains 333 as substring.

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, 61825265243 + ... + 61825266074.

Almost surely, 2^{51438621027872} is an apocalyptic number.

51438621027872 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

51438621027872 is an abundant number, since it is smaller than the sum of its proper divisors (57621147594604).

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

51438621027872 is a wasteful number, since it uses less digits than its factorization.

51438621027872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123650531340 (or 123650531332 counting only the distinct ones).

The product of its (nonzero) digits is 9031680, while the sum is 56.

The spelling of 51438621027872 in words is "fifty-one trillion, four hundred thirty-eight billion, six hundred twenty-one million, twenty-seven thousand, eight hundred seventy-two".