51351312240 has 120 divisors (see below), whose sum is σ = 172551710448. Its totient is φ = 13685990400.

The previous prime is 51351312193. The next prime is 51351312263. The reversal of 51351312240 is 4221315315.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1325140 + ... + 1363340.

Almost surely, 2^51351312240 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 51351312240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86275855224).

51351312240 is an abundant number, since it is smaller than the sum of its proper divisors (121200398208).

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

51351312240 is a wasteful number, since it uses less digits than its factorization.

51351312240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40087 (or 40078 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 51351312240 its reverse (4221315315), we get a palindrome (55572627555).

The spelling of 51351312240 in words is "fifty-one billion, three hundred fifty-one million, three hundred twelve thousand, two hundred forty".