2660775201221 has 4 divisors (see below), whose sum is σ = 2663695921344. Its totient is φ = 2657854481100.

The previous prime is 2660775201211. The next prime is 2660775201239. The reversal of 2660775201221 is 1221025770662.

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 a de Polignac number, because none of the positive numbers 2^k-2660775201221 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 (2660775201211) 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, 1460358695 + ... + 1460360516.

It is an arithmetic number, because the mean of its divisors is an integer number (665923980336).

Almost surely, 2^{2660775201221} is an apocalyptic number.

It is an amenable number.

2660775201221 is a deficient number, since it is larger than the sum of its proper divisors (2920720123).

2660775201221 is an equidigital number, since it uses as much as digits as its factorization.

2660775201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2920720122.

The product of its (nonzero) digits is 141120, while the sum is 41.

The spelling of 2660775201221 in words is "two trillion, six hundred sixty billion, seven hundred seventy-five million, two hundred one thousand, two hundred twenty-one".