51595640824 has 128 divisors (see below), whose sum is σ = 124569446400. Its totient is φ = 19489397760.

The previous prime is 51595640819. The next prime is 51595640843. The reversal of 51595640824 is 42804659515.

It is a happy number.

It is a super-2 number, since 2×51595640824² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1384467 + ... + 1421245.

It is an arithmetic number, because the mean of its divisors is an integer number (973198800).

Almost surely, 2^51595640824 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 51595640824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62284723200).

51595640824 is an abundant number, since it is smaller than the sum of its proper divisors (72973805576).

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

51595640824 is a wasteful number, since it uses less digits than its factorization.

51595640824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36893 (or 36889 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 49.

The spelling of 51595640824 in words is "fifty-one billion, five hundred ninety-five million, six hundred forty thousand, eight hundred twenty-four".