51800445136 has 40 divisors (see below), whose sum is σ = 115927740864. Its totient is φ = 22160616960.

The previous prime is 51800445127. The next prime is 51800445149. The reversal of 51800445136 is 63154400815.

It is a happy number.

It is a super-2 number, since 2×51800445136² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51800445095 and 51800445104.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8653500 + ... + 8659483.

Almost surely, 2^51800445136 is an apocalyptic number.

It is an amenable number.

51800445136 is an abundant number, since it is smaller than the sum of its proper divisors (64127295728).

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

51800445136 is a wasteful number, since it uses less digits than its factorization.

51800445136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17313019 (or 17313013 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

The spelling of 51800445136 in words is "fifty-one billion, eight hundred million, four hundred forty-five thousand, one hundred thirty-six".