51555142540 has 96 divisors (see below), whose sum is σ = 118981545984. Its totient is φ = 18609212160.

The previous prime is 51555142537. The next prime is 51555142549. The reversal of 51555142540 is 4524155515.

It is a self number, because there is not a number n which added to its sum of digits gives 51555142540.

It is not an unprimeable number, because it can be changed into a prime (51555142549) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19475497 + ... + 19478143.

It is an arithmetic number, because the mean of its divisors is an integer number (1239391104).

Almost surely, 2^51555142540 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 51555142540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59490772992).

51555142540 is an abundant number, since it is smaller than the sum of its proper divisors (67426403444).

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

51555142540 is a wasteful number, since it uses less digits than its factorization.

51555142540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3287 (or 3285 counting only the distinct ones).

The product of its (nonzero) digits is 100000, while the sum is 37.

The spelling of 51555142540 in words is "fifty-one billion, five hundred fifty-five million, one hundred forty-two thousand, five hundred forty".