2666153621 has 2 divisors, whose sum is σ = 2666153622. Its totient is φ = 2666153620.

The previous prime is 2666153603. The next prime is 2666153641. The reversal of 2666153621 is 1263516662.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2425562500 + 240591121 = 49250^2 + 15511^2 .

It is a cyclic number.

It is not a de Polignac number, because 2666153621 - 2⁶ = 2666153557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2666153641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1333076810 + 1333076811.

It is an arithmetic number, because the mean of its divisors is an integer number (1333076811).

Almost surely, 2^2666153621 is an apocalyptic number.

It is an amenable number.

2666153621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2666153621 is an equidigital number, since it uses as much as digits as its factorization.

2666153621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 38.

The square root of 2666153621 is about 51634.8101671731. The cubic root of 2666153621 is about 1386.6336114981.

The spelling of 2666153621 in words is "two billion, six hundred sixty-six million, one hundred fifty-three thousand, six hundred twenty-one".