51559834644 has 72 divisors (see below), whose sum is σ = 131429346048. Its totient is φ = 17042088960.

The previous prime is 51559834631. The next prime is 51559834661. The reversal of 51559834644 is 44643895515.

51559834644 is a `hidden beast` number, since 5 + 1 + 5 + 598 + 3 + 4 + 6 + 44 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7386484 + ... + 7393460.

It is an arithmetic number, because the mean of its divisors is an integer number (1825407584).

Almost surely, 2^51559834644 is an apocalyptic number.

It is an amenable number.

51559834644 is an abundant number, since it is smaller than the sum of its proper divisors (79869511404).

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

51559834644 is a wasteful number, since it uses less digits than its factorization.

51559834644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8685 (or 8680 counting only the distinct ones).

The product of its digits is 10368000, while the sum is 54.

The spelling of 51559834644 in words is "fifty-one billion, five hundred fifty-nine million, eight hundred thirty-four thousand, six hundred forty-four".