2665221473 has 2 divisors, whose sum is σ = 2665221474. Its totient is φ = 2665221472.

The previous prime is 2665221401. The next prime is 2665221479. The reversal of 2665221473 is 3741225662.

2665221473 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1990676689 + 674544784 = 44617^2 + 25972^2 .

It is a cyclic number.

It is not a de Polignac number, because 2665221473 - 2¹⁰ = 2665220449 is a prime.

It is not a weakly prime, because it can be changed into another prime (2665221479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1332610736 + 1332610737.

It is an arithmetic number, because the mean of its divisors is an integer number (1332610737).

Almost surely, 2^2665221473 is an apocalyptic number.

It is an amenable number.

2665221473 is a deficient number, since it is larger than the sum of its proper divisors (1).

2665221473 is an equidigital number, since it uses as much as digits as its factorization.

2665221473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 38.

The square root of 2665221473 is about 51625.7830255387. The cubic root of 2665221473 is about 1386.4719931025.

The spelling of 2665221473 in words is "two billion, six hundred sixty-five million, two hundred twenty-one thousand, four hundred seventy-three".