6662641 has 2 divisors, whose sum is σ = 6662642. Its totient is φ = 6662640.

The previous prime is 6662633. The next prime is 6662651. The reversal of 6662641 is 1462666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6656400 + 6241 = 2580^2 + 79^2 .

It is a cyclic number.

It is not a de Polignac number, because 6662641 - 2³ = 6662633 is a prime.

It is not a weakly prime, because it can be changed into another prime (6662651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3331320 + 3331321.

It is an arithmetic number, because the mean of its divisors is an integer number (3331321).

Almost surely, 2^6662641 is an apocalyptic number.

6662641 is the 1633-rd centered pentagonal number.

It is an amenable number.

6662641 is a deficient number, since it is larger than the sum of its proper divisors (1).

6662641 is an equidigital number, since it uses as much as digits as its factorization.

6662641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 31.

The square root of 6662641 is about 2581.2092127528. The cubic root of 6662641 is about 188.1693151747.

The spelling of 6662641 in words is "six million, six hundred sixty-two thousand, six hundred forty-one".