51881562480 has 320 divisors, whose sum is σ = 177798905856. Its totient is φ = 12410496000.

The previous prime is 51881562479. The next prime is 51881562497. The reversal of 51881562480 is 8426518815.

It is a super-2 number, since 2×51881562480² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 90860595 + ... + 90861165.

Almost surely, 2^51881562480 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 51881562480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88899452928).

51881562480 is an abundant number, since it is smaller than the sum of its proper divisors (125917343376).

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

51881562480 is a wasteful number, since it uses less digits than its factorization.

51881562480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 996 (or 990 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 48.

The spelling of 51881562480 in words is "fifty-one billion, eight hundred eighty-one million, five hundred sixty-two thousand, four hundred eighty".