7266661 has 2 divisors, whose sum is σ = 7266662. Its totient is φ = 7266660.

The previous prime is 7266653. The next prime is 7266673. The reversal of 7266661 is 1666627.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7257636 + 9025 = 2694^2 + 95^2 .

It is an emirp because it is prime and its reverse (1666627) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7266661 - 2³ = 7266653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7266601) 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, 3633330 + 3633331.

It is an arithmetic number, because the mean of its divisors is an integer number (3633331).

Almost surely, 2^7266661 is an apocalyptic number.

It is an amenable number.

7266661 is a deficient number, since it is larger than the sum of its proper divisors (1).

7266661 is an equidigital number, since it uses as much as digits as its factorization.

7266661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 34.

The square root of 7266661 is about 2695.6744981544. The cubic root of 7266661 is about 193.6919776310.

Subtracting from 7266661 its sum of digits (34), we obtain a palindrome (7266627).

It can be divided in two parts, 72666 and 61, that added together give a palindrome (72727).

The spelling of 7266661 in words is "seven million, two hundred sixty-six thousand, six hundred sixty-one".