2665221401 has 2 divisors, whose sum is σ = 2665221402. Its totient is φ = 2665221400.

The previous prime is 2665221353. The next prime is 2665221473. The reversal of 2665221401 is 1041225662.

2665221401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2641446025 + 23775376 = 51395^2 + 4876^2 .

It is a cyclic number.

It is not a de Polignac number, because 2665221401 - 2²² = 2661027097 is a prime.

It is not a weakly prime, because it can be changed into another prime (2665221901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1332610700 + 1332610701.

It is an arithmetic number, because the mean of its divisors is an integer number (1332610701).

Almost surely, 2^2665221401 is an apocalyptic number.

It is an amenable number.

2665221401 is a deficient number, since it is larger than the sum of its proper divisors (1).

2665221401 is an equidigital number, since it uses as much as digits as its factorization.

2665221401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 2665221401 is about 51625.7823282127. The cubic root of 2665221401 is about 1386.4719806175.

The spelling of 2665221401 in words is "two billion, six hundred sixty-five million, two hundred twenty-one thousand, four hundred one".