65840973198 has 128 divisors (see below), whose sum is σ = 176912031744. Its totient is φ = 15776380800.

The previous prime is 65840973193. The next prime is 65840973199. The reversal of 65840973198 is 89137904856.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65840973193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 16832863 + ... + 16836773.

It is an arithmetic number, because the mean of its divisors is an integer number (1382125248).

Almost surely, 2^65840973198 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65840973198, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88456015872).

65840973198 is an abundant number, since it is smaller than the sum of its proper divisors (111071058546).

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

65840973198 is a wasteful number, since it uses less digits than its factorization.

65840973198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6750.

The product of its (nonzero) digits is 13063680, while the sum is 60.

The spelling of 65840973198 in words is "sixty-five billion, eight hundred forty million, nine hundred seventy-three thousand, one hundred ninety-eight".