51210534540 has 96 divisors (see below), whose sum is σ = 163226036736. Its totient is φ = 11874903040.

The previous prime is 51210534521. The next prime is 51210534581. The reversal of 51210534540 is 4543501215.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 51210534498 and 51210534507.

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, 1671597 + ... + 1701956.

It is an arithmetic number, because the mean of its divisors is an integer number (1700271216).

Almost surely, 2^51210534540 is an apocalyptic number.

It is an amenable number.

51210534540 is an abundant number, since it is smaller than the sum of its proper divisors (112015502196).

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

51210534540 is a wasteful number, since it uses less digits than its factorization.

51210534540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3373599 (or 3373597 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

It can be divided in two parts, 512105 and 34540, that added together give a palindrome (546645).

The spelling of 51210534540 in words is "fifty-one billion, two hundred ten million, five hundred thirty-four thousand, five hundred forty".