51326405540 has 24 divisors (see below), whose sum is σ = 107790600960. Its totient is φ = 20529581408.

The previous prime is 51326405503. The next prime is 51326405561. The reversal of 51326405540 is 4550462315.

It is a self number, because there is not a number n which added to its sum of digits gives 51326405540.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 487751 + ... + 583569.

It is an arithmetic number, because the mean of its divisors is an integer number (4491275040).

Almost surely, 2^51326405540 is an apocalyptic number.

It is an amenable number.

51326405540 is an abundant number, since it is smaller than the sum of its proper divisors (56464195420).

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

51326405540 is a wasteful number, since it uses less digits than its factorization.

51326405540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122611 (or 122609 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 35.

Adding to 51326405540 its reverse (4550462315), we get a palindrome (55876867855).

The spelling of 51326405540 in words is "fifty-one billion, three hundred twenty-six million, four hundred five thousand, five hundred forty".