51897600000 has 864 divisors, whose sum is σ = 202113704520. Its totient is φ = 12779520000.

The previous prime is 51897599939. The next prime is 51897600037. The reversal of 51897600000 is 679815.

It can be written as a sum of positive squares in 12 ways, for example, as 11293737984 + 40603862016 = 106272^2 + 201504^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 979199974 + ... + 979200026.

Almost surely, 2^51897600000 is an apocalyptic number.

51897600000 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 51897600000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101056852260).

51897600000 is an abundant number, since it is smaller than the sum of its proper divisors (150216104520).

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

51897600000 is an equidigital number, since it uses as much as digits as its factorization.

51897600000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123 (or 80 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The spelling of 51897600000 in words is "fifty-one billion, eight hundred ninety-seven million, six hundred thousand".