51663725600 has 72 divisors (see below), whose sum is σ = 126213828048. Its totient is φ = 20650784000.

The previous prime is 51663725573. The next prime is 51663725627. The reversal of 51663725600 is 652736615.

It is an interprime number because it is at equal distance from previous prime (51663725573) and next prime (51663725627).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1138547 + ... + 1183053.

It is an arithmetic number, because the mean of its divisors is an integer number (1752969834).

Almost surely, 2^51663725600 is an apocalyptic number.

51663725600 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 51663725600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63106914024).

51663725600 is an abundant number, since it is smaller than the sum of its proper divisors (74550102448).

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

51663725600 is a wasteful number, since it uses less digits than its factorization.

51663725600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45978 (or 45965 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 41.

The spelling of 51663725600 in words is "fifty-one billion, six hundred sixty-three million, seven hundred twenty-five thousand, six hundred".