65640221650001 has 4 divisors (see below), whose sum is σ = 65640247772400. Its totient is φ = 65640195527604.

The previous prime is 65640221649949. The next prime is 65640221650039. The reversal of 65640221650001 is 10005612204656.

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 a cyclic number.

It is not a de Polignac number, because 65640221650001 - 2²² = 65640217455697 is a prime.

It is a super-2 number, since 2×65640221650001² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65640221656001) 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, 8836511 + ... + 14469428.

It is an arithmetic number, because the mean of its divisors is an integer number (16410061943100).

Almost surely, 2^{65640221650001} is an apocalyptic number.

It is an amenable number.

65640221650001 is a deficient number, since it is larger than the sum of its proper divisors (26122399).

65640221650001 is a wasteful number, since it uses less digits than its factorization.

65640221650001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26122398.

The product of its (nonzero) digits is 86400, while the sum is 38.

Adding to 65640221650001 its reverse (10005612204656), we get a palindrome (75645833854657).

The spelling of 65640221650001 in words is "sixty-five trillion, six hundred forty billion, two hundred twenty-one million, six hundred fifty thousand, one".