51766615540 has 48 divisors (see below), whose sum is σ = 111596284800. Its totient is φ = 20159959680.

The previous prime is 51766615477. The next prime is 51766615567. The reversal of 51766615540 is 4551666715.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170686 + ... + 364234.

It is an arithmetic number, because the mean of its divisors is an integer number (2324922600).

Almost surely, 2^51766615540 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 51766615540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55798142400).

51766615540 is an abundant number, since it is smaller than the sum of its proper divisors (59829669260).

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

51766615540 is a wasteful number, since it uses less digits than its factorization.

51766615540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193912 (or 193910 counting only the distinct ones).

The product of its (nonzero) digits is 756000, while the sum is 46.

The spelling of 51766615540 in words is "fifty-one billion, seven hundred sixty-six million, six hundred fifteen thousand, five hundred forty".