65426643217 has 8 divisors (see below), whose sum is σ = 70684576424. Its totient is φ = 60200869248.

The previous prime is 65426643211. The next prime is 65426643239. The reversal of 65426643217 is 71234662456.

It can be written as a sum of positive squares in 4 ways, for example, as 16291714321 + 49134928896 = 127639^2 + 221664^2 .

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

It is not a de Polignac number, because 65426643217 - 2³ = 65426643209 is a prime.

It is a super-2 number, since 2×65426643217² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65426643211) 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, 8035578 + ... + 8043715.

It is an arithmetic number, because the mean of its divisors is an integer number (8835572053).

Almost surely, 2^65426643217 is an apocalyptic number.

It is an amenable number.

65426643217 is a deficient number, since it is larger than the sum of its proper divisors (5257933207).

65426643217 is a wasteful number, since it uses less digits than its factorization.

65426643217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16079619.

The product of its digits is 1451520, while the sum is 46.

The spelling of 65426643217 in words is "sixty-five billion, four hundred twenty-six million, six hundred forty-three thousand, two hundred seventeen".