51556814500 has 96 divisors (see below), whose sum is σ = 115162145280. Its totient is φ = 20154771200.

The previous prime is 51556814489. The next prime is 51556814501. The reversal of 51556814500 is 541865515.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (51556814501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23945424 + ... + 23947576.

It is an arithmetic number, because the mean of its divisors is an integer number (1199605680).

Almost surely, 2^51556814500 is an apocalyptic number.

51556814500 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 51556814500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57581072640).

51556814500 is an abundant number, since it is smaller than the sum of its proper divisors (63605330780).

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

51556814500 is a wasteful number, since it uses less digits than its factorization.

51556814500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3238 (or 3226 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 40.

The spelling of 51556814500 in words is "fifty-one billion, five hundred fifty-six million, eight hundred fourteen thousand, five hundred".