51117278380 has 48 divisors (see below), whose sum is σ = 122725048320. Its totient is φ = 17519698368.

The previous prime is 51117278371. The next prime is 51117278383. The reversal of 51117278380 is 8387271115.

It is a super-2 number, since 2×51117278380² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51117278383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 339649 + ... + 466471.

It is an arithmetic number, because the mean of its divisors is an integer number (2556771840).

Almost surely, 2^51117278380 is an apocalyptic number.

It is an amenable number.

51117278380 is an abundant number, since it is smaller than the sum of its proper divisors (71607769940).

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

51117278380 is a wasteful number, since it uses less digits than its factorization.

51117278380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129718 (or 129716 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 43.

The spelling of 51117278380 in words is "fifty-one billion, one hundred seventeen million, two hundred seventy-eight thousand, three hundred eighty".