51216251680278 has 48 divisors (see below), whose sum is σ = 113068069536240. Its totient is φ = 16749113090112.

The previous prime is 51216251680183. The next prime is 51216251680301. The reversal of 51216251680278 is 87208615261215.

51216251680278 is a `hidden beast` number, since 5 + 1 + 2 + 1 + 625 + 1 + 6 + 8 + 0 + 2 + 7 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17440425 + ... + 20164347.

It is an arithmetic number, because the mean of its divisors is an integer number (2355584782005).

Almost surely, 2^{51216251680278} is an apocalyptic number.

51216251680278 is an abundant number, since it is smaller than the sum of its proper divisors (61851817855962).

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

51216251680278 is a wasteful number, since it uses less digits than its factorization.

51216251680278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2743693 (or 2743690 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 54.

The spelling of 51216251680278 in words is "fifty-one trillion, two hundred sixteen billion, two hundred fifty-one million, six hundred eighty thousand, two hundred seventy-eight".