51655500 has 144 divisors (see below), whose sum is σ = 175689696. Its totient is φ = 12700800.

The previous prime is 51655489. The next prime is 51655501. The reversal of 51655500 is 555615.

51655500 = 195² + 196² + ... + 545².

51655500 is a `hidden beast` number, since 5 + 1 + 655 + 5 + 0 + 0 = 666.

It is not an unprimeable number, because it can be changed into a prime (51655501) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 58059 + ... + 58941.

Almost surely, 2^51655500 is an apocalyptic number.

51655500 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 51655500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87844848).

51655500 is an abundant number, since it is smaller than the sum of its proper divisors (124034196).

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

51655500 is a wasteful number, since it uses less digits than its factorization.

51655500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921 (or 906 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 51655500 is about 7187.1760796574. The cubic root of 51655500 is about 372.4250258248.

The spelling of 51655500 in words is "fifty-one million, six hundred fifty-five thousand, five hundred".