51172127215440 has 320 divisors, whose sum is σ = 209410888273920. Its totient is φ = 10007688683520.

The previous prime is 51172127215411. The next prime is 51172127215453. The reversal of 51172127215440 is 4451272127115.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 51172127215392 and 51172127215401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 81128620 + ... + 81756939.

It is an arithmetic number, because the mean of its divisors is an integer number (654409025856).

Almost surely, 2^{51172127215440} is an apocalyptic number.

It is an amenable number.

51172127215440 is an abundant number, since it is smaller than the sum of its proper divisors (158238761058480).

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

51172127215440 is a wasteful number, since it uses less digits than its factorization.

51172127215440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162885610 (or 162885604 counting only the distinct ones).

The product of its (nonzero) digits is 156800, while the sum is 42.

The spelling of 51172127215440 in words is "fifty-one trillion, one hundred seventy-two billion, one hundred twenty-seven million, two hundred fifteen thousand, four hundred forty".