65447373031221 has 4 divisors (see below), whose sum is σ = 87263164041632. Its totient is φ = 43631582020812.

The previous prime is 65447373031169. The next prime is 65447373031253. The reversal of 65447373031221 is 12213037374456.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 65447373031221 - 2⁷ = 65447373031093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65447373031421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10907895505201 + ... + 10907895505206.

It is an arithmetic number, because the mean of its divisors is an integer number (21815791010408).

Almost surely, 2^{65447373031221} is an apocalyptic number.

It is an amenable number.

65447373031221 is a deficient number, since it is larger than the sum of its proper divisors (21815791010411).

65447373031221 is a wasteful number, since it uses less digits than its factorization.

65447373031221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21815791010410.

The product of its (nonzero) digits is 2540160, while the sum is 48.

The spelling of 65447373031221 in words is "sixty-five trillion, four hundred forty-seven billion, three hundred seventy-three million, thirty-one thousand, two hundred twenty-one".