51535321500 has 192 divisors, whose sum is σ = 171122620032. Its totient is φ = 11939328000.

The previous prime is 51535321477. The next prime is 51535321511. The reversal of 51535321500 is 512353515.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 253770 + ... + 409230.

It is an arithmetic number, because the mean of its divisors is an integer number (891263646).

Almost surely, 2^51535321500 is an apocalyptic number.

51535321500 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 51535321500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85561310016).

51535321500 is an abundant number, since it is smaller than the sum of its proper divisors (119587298532).

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

51535321500 is a wasteful number, since it uses less digits than its factorization.

51535321500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155513 (or 155501 counting only the distinct ones).

The product of its (nonzero) digits is 11250, while the sum is 30.

The spelling of 51535321500 in words is "fifty-one billion, five hundred thirty-five million, three hundred twenty-one thousand, five hundred".