51855351720198 has 32 divisors (see below), whose sum is σ = 113519408063712. Its totient is φ = 15693927379200.

The previous prime is 51855351720191. The next prime is 51855351720209. The reversal of 51855351720198 is 89102715355815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51855351720191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5449275583 + ... + 5449285098.

It is an arithmetic number, because the mean of its divisors is an integer number (3547481501991).

Almost surely, 2^{51855351720198} is an apocalyptic number.

51855351720198 is an abundant number, since it is smaller than the sum of its proper divisors (61664056343514).

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

51855351720198 is a wasteful number, since it uses less digits than its factorization.

51855351720198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10898560760.

The product of its (nonzero) digits is 15120000, while the sum is 60.

The spelling of 51855351720198 in words is "fifty-one trillion, eight hundred fifty-five billion, three hundred fifty-one million, seven hundred twenty thousand, one hundred ninety-eight".