65191984321 has 8 divisors (see below), whose sum is σ = 65408688000. Its totient is φ = 64975599360.

The previous prime is 65191984307. The next prime is 65191984343. The reversal of 65191984321 is 12348919156.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65191984321 - 2²⁷ = 65057766593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65191984381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 333636 + ... + 491626.

It is an arithmetic number, because the mean of its divisors is an integer number (8176086000).

Almost surely, 2^65191984321 is an apocalyptic number.

It is an amenable number.

65191984321 is a deficient number, since it is larger than the sum of its proper divisors (216703679).

65191984321 is a wasteful number, since it uses less digits than its factorization.

65191984321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159359.

The product of its digits is 466560, while the sum is 49.

The spelling of 65191984321 in words is "sixty-five billion, one hundred ninety-one million, nine hundred eighty-four thousand, three hundred twenty-one".