65071688321 has 4 divisors (see below), whose sum is σ = 65258140500. Its totient is φ = 64885236144.

The previous prime is 65071688291. The next prime is 65071688359. The reversal of 65071688321 is 12388617056.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52057441921 + 13014246400 = 228161^2 + 114080^2 .

It is a cyclic number.

It is not a de Polignac number, because 65071688321 - 2²⁶ = 65004579457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65071388321) 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, 93225566 + ... + 93226263.

It is an arithmetic number, because the mean of its divisors is an integer number (16314535125).

Almost surely, 2^65071688321 is an apocalyptic number.

It is an amenable number.

65071688321 is a deficient number, since it is larger than the sum of its proper divisors (186452179).

65071688321 is a wasteful number, since it uses less digits than its factorization.

65071688321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186452178.

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 65071688321 in words is "sixty-five billion, seventy-one million, six hundred eighty-eight thousand, three hundred twenty-one".