51440440500 has 96 divisors (see below), whose sum is σ = 166438446720. Its totient is φ = 13717447200.

The previous prime is 51440440477. The next prime is 51440440661. The reversal of 51440440500 is 504404415.

It is a super-2 number, since 2×51440440500² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 1891702 + ... + 1918701.

It is an arithmetic number, because the mean of its divisors is an integer number (1733733820).

Almost surely, 2^51440440500 is an apocalyptic number.

51440440500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51440440500 is an abundant number, since it is smaller than the sum of its proper divisors (114998006220).

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

51440440500 is a wasteful number, since it uses less digits than its factorization.

51440440500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3810431 (or 3810413 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

Adding to 51440440500 its reverse (504404415), we get a palindrome (51944844915).

The spelling of 51440440500 in words is "fifty-one billion, four hundred forty million, four hundred forty thousand, five hundred".