51139421760 has 448 divisors, whose sum is σ = 205031596032. Its totient is φ = 10522558464.

The previous prime is 51139421759. The next prime is 51139421761. The reversal of 51139421760 is 6712493115.

It is an interprime number because it is at equal distance from previous prime (51139421759) and next prime (51139421761).

It is a tau number, because it is divible by the number of its divisors (448).

It is a super-2 number, since 2×51139421760² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51139421761) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2617789 + ... + 2637251.

Almost surely, 2^51139421760 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51139421760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102515798016).

51139421760 is an abundant number, since it is smaller than the sum of its proper divisors (153892174272).

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

51139421760 is a wasteful number, since it uses less digits than its factorization.

51139421760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19530 (or 19520 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 39.

The spelling of 51139421760 in words is "fifty-one billion, one hundred thirty-nine million, four hundred twenty-one thousand, seven hundred sixty".