65170016621 has 8 divisors (see below), whose sum is σ = 65610128640. Its totient is φ = 64731225312.

The previous prime is 65170016617. The next prime is 65170016623. The reversal of 65170016621 is 12661007156.

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 65170016621 - 2² = 65170016617 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 (65170016623) 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, 231056 + ... + 428633.

It is an arithmetic number, because the mean of its divisors is an integer number (8201266080).

Almost surely, 2^65170016621 is an apocalyptic number.

It is an amenable number.

65170016621 is a deficient number, since it is larger than the sum of its proper divisors (440112019).

65170016621 is a wasteful number, since it uses less digits than its factorization.

65170016621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660355.

The product of its (nonzero) digits is 15120, while the sum is 35.

The spelling of 65170016621 in words is "sixty-five billion, one hundred seventy million, sixteen thousand, six hundred twenty-one".