51805187960 has 64 divisors (see below), whose sum is σ = 122960073600. Its totient is φ = 19589268096.

The previous prime is 51805187923. The next prime is 51805187969. The reversal of 51805187960 is 6978150815.

It is a junction number, because it is equal to n+sod(n) for n = 51805187899 and 51805187908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51805187969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 281939 + ... + 427901.

It is an arithmetic number, because the mean of its divisors is an integer number (1921251150).

Almost surely, 2^51805187960 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 51805187960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61480036800).

51805187960 is an abundant number, since it is smaller than the sum of its proper divisors (71154885640).

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

51805187960 is a wasteful number, since it uses less digits than its factorization.

51805187960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146460 (or 146456 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 50.

The spelling of 51805187960 in words is "fifty-one billion, eight hundred five million, one hundred eighty-seven thousand, nine hundred sixty".