7506661 has 2 divisors, whose sum is σ = 7506662. Its totient is φ = 7506660.

The previous prime is 7506647. The next prime is 7506677. The reversal of 7506661 is 1666057.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5832225 + 1674436 = 2415^2 + 1294^2 .

It is a cyclic number.

It is not a de Polignac number, because 7506661 - 2¹¹ = 7504613 is a prime.

It is an Ulam number.

It is equal to p₅₀₈₆₈₄ and since 7506661 and 508684 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7506601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3753330 + 3753331.

It is an arithmetic number, because the mean of its divisors is an integer number (3753331).

Almost surely, 2^7506661 is an apocalyptic number.

7506661 is the 1465-th centered heptagonal number.

It is an amenable number.

7506661 is a deficient number, since it is larger than the sum of its proper divisors (1).

7506661 is an equidigital number, since it uses as much as digits as its factorization.

7506661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 7506661 is about 2739.8286442769. The cubic root of 7506661 is about 195.8013136523.

The spelling of 7506661 in words is "seven million, five hundred six thousand, six hundred sixty-one".