51595991040 has 384 divisors, whose sum is σ = 181291219200. Its totient is φ = 12423659520.

The previous prime is 51595991023. The next prime is 51595991053. The reversal of 51595991040 is 4019959515.

It is a tau number, because it is divible by the number of its divisors (384).

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60487254 + ... + 60488106.

It is an arithmetic number, because the mean of its divisors is an integer number (472112550).

Almost surely, 2^51595991040 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 51595991040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90645609600).

51595991040 is an abundant number, since it is smaller than the sum of its proper divisors (129695228160).

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

51595991040 is a wasteful number, since it uses less digits than its factorization.

51595991040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073 (or 1053 counting only the distinct ones).

The product of its (nonzero) digits is 364500, while the sum is 48.

The spelling of 51595991040 in words is "fifty-one billion, five hundred ninety-five million, nine hundred ninety-one thousand, forty".