65605720101601 has 4 divisors (see below), whose sum is σ = 66218857672752. Its totient is φ = 64992582530452.

The previous prime is 65605720101563. The next prime is 65605720101611. The reversal of 65605720101601 is 10610102750656.

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 65605720101601 - 2¹¹ = 65605720099553 is a prime.

It is a super-2 number, since 2×65605720101601² (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 (65605720101611) 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, 306568785415 + ... + 306568785628.

It is an arithmetic number, because the mean of its divisors is an integer number (16554714418188).

Almost surely, 2^{65605720101601} is an apocalyptic number.

It is an amenable number.

65605720101601 is a deficient number, since it is larger than the sum of its proper divisors (613137571151).

65605720101601 is a wasteful number, since it uses less digits than its factorization.

65605720101601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613137571150.

The product of its (nonzero) digits is 75600, while the sum is 40.

The spelling of 65605720101601 in words is "sixty-five trillion, six hundred five billion, seven hundred twenty million, one hundred one thousand, six hundred one".