65800021173 has 16 divisors (see below), whose sum is σ = 88137265920. Its totient is φ = 43664819904.

The previous prime is 65800021123. The next prime is 65800021207. The reversal of 65800021173 is 37112000856.

It is not a de Polignac number, because 65800021173 - 2⁹ = 65800020661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65800021123) 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, 3875140 + ... + 3892082.

It is an arithmetic number, because the mean of its divisors is an integer number (5508579120).

Almost surely, 2^65800021173 is an apocalyptic number.

It is an amenable number.

65800021173 is a deficient number, since it is larger than the sum of its proper divisors (22337244747).

65800021173 is a wasteful number, since it uses less digits than its factorization.

65800021173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22828.

The product of its (nonzero) digits is 10080, while the sum is 33.

The spelling of 65800021173 in words is "sixty-five billion, eight hundred million, twenty-one thousand, one hundred seventy-three".