51633121500 has 144 divisors (see below), whose sum is σ = 163045602720. Its totient is φ = 13755283200.

The previous prime is 51633121499. The next prime is 51633121513. The reversal of 51633121500 is 512133615.

51633121500 is a `hidden beast` number, since 5 + 1 + 6 + 33 + 121 + 500 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5075419 + ... + 5085581.

It is an arithmetic number, because the mean of its divisors is an integer number (1132261130).

Almost surely, 2^51633121500 is an apocalyptic number.

51633121500 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 51633121500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81522801360).

51633121500 is an abundant number, since it is smaller than the sum of its proper divisors (111412481220).

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

51633121500 is a wasteful number, since it uses less digits than its factorization.

51633121500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11317 (or 11302 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The spelling of 51633121500 in words is "fifty-one billion, six hundred thirty-three million, one hundred twenty-one thousand, five hundred".