51909430544 has 20 divisors (see below), whose sum is σ = 101013718860. Its totient is φ = 25841374080.

The previous prime is 51909430499. The next prime is 51909430553. The reversal of 51909430544 is 44503490915.

It can be written as a sum of positive squares in 2 ways, for example, as 28197126400 + 23712304144 = 167920^2 + 153988^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51909430495 and 51909430504.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7080047 + ... + 7087374.

It is an arithmetic number, because the mean of its divisors is an integer number (5050685943).

Almost surely, 2^51909430544 is an apocalyptic number.

It is an amenable number.

51909430544 is a deficient number, since it is larger than the sum of its proper divisors (49104288316).

51909430544 is a wasteful number, since it uses less digits than its factorization.

51909430544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14167658 (or 14167652 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 44.

The spelling of 51909430544 in words is "fifty-one billion, nine hundred nine million, four hundred thirty thousand, five hundred forty-four".