51365540500 has 96 divisors (see below), whose sum is σ = 118423468800. Its totient is φ = 19409328000.

The previous prime is 51365540497. The next prime is 51365540531. The reversal of 51365540500 is 504556315.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3402970 + ... + 3418030.

It is an arithmetic number, because the mean of its divisors is an integer number (1233577800).

Almost surely, 2^51365540500 is an apocalyptic number.

51365540500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51365540500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59211734400).

51365540500 is an abundant number, since it is smaller than the sum of its proper divisors (67057928300).

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

51365540500 is a wasteful number, since it uses less digits than its factorization.

51365540500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15458 (or 15446 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 34.

The spelling of 51365540500 in words is "fifty-one billion, three hundred sixty-five million, five hundred forty thousand, five hundred".