65555050638 has 96 divisors (see below), whose sum is σ = 165146623488. Its totient is φ = 16981145280.

The previous prime is 65555050619. The next prime is 65555050663. The reversal of 65555050638 is 83605055556.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1878295 + ... + 1912877.

It is an arithmetic number, because the mean of its divisors is an integer number (1720277328).

Almost surely, 2^65555050638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65555050638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82573311744).

65555050638 is an abundant number, since it is smaller than the sum of its proper divisors (99591572850).

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

65555050638 is a wasteful number, since it uses less digits than its factorization.

65555050638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34990 (or 34979 counting only the distinct ones).

The product of its (nonzero) digits is 2700000, while the sum is 48.

The spelling of 65555050638 in words is "sixty-five billion, five hundred fifty-five million, fifty thousand, six hundred thirty-eight".