51422878002420 has 72 divisors (see below), whose sum is σ = 155990700162024. Its totient is φ = 13712066788608.

The previous prime is 51422878002389. The next prime is 51422878002427. The reversal of 51422878002420 is 2420087822415.

51422878002420 is a `hidden beast` number, since 5 + 142 + 2 + 8 + 7 + 80 + 0 + 2 + 420 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 395457353316 + 51027420649104 = 628854^2 + 7143348^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51422878002427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3761479 + ... + 10816398.

Almost surely, 2^{51422878002420} is an apocalyptic number.

It is an amenable number.

51422878002420 is an abundant number, since it is smaller than the sum of its proper divisors (104567822159604).

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

51422878002420 is a wasteful number, since it uses less digits than its factorization.

51422878002420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14597489 (or 14597484 counting only the distinct ones).

The product of its (nonzero) digits is 573440, while the sum is 45.

The spelling of 51422878002420 in words is "fifty-one trillion, four hundred twenty-two billion, eight hundred seventy-eight million, two thousand, four hundred twenty".