7165661 has 2 divisors, whose sum is σ = 7165662. Its totient is φ = 7165660.

The previous prime is 7165633. The next prime is 7165663. The reversal of 7165661 is 1665617.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6661561 + 504100 = 2581^2 + 710^2 .

It is a cyclic number.

It is not a de Polignac number, because 7165661 - 2⁶ = 7165597 is a prime.

Together with 7165663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7165663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3582830 + 3582831.

It is an arithmetic number, because the mean of its divisors is an integer number (3582831).

Almost surely, 2^7165661 is an apocalyptic number.

It is an amenable number.

7165661 is a deficient number, since it is larger than the sum of its proper divisors (1).

7165661 is an equidigital number, since it uses as much as digits as its factorization.

7165661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7560, while the sum is 32.

The square root of 7165661 is about 2676.8752305627. The cubic root of 7165661 is about 192.7904066696.

It can be divided in two parts, 71656 and 61, that added together give a palindrome (71717).

The spelling of 7165661 in words is "seven million, one hundred sixty-five thousand, six hundred sixty-one".