7611661 has 2 divisors, whose sum is σ = 7611662. Its totient is φ = 7611660.

The previous prime is 7611613. The next prime is 7611673. The reversal of 7611661 is 1661167.

7611661 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7257636 + 354025 = 2694^2 + 595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7611661 is a prime.

It is an Ulam number.

7611661 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7611061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3805830 + 3805831.

It is an arithmetic number, because the mean of its divisors is an integer number (3805831).

Almost surely, 2^7611661 is an apocalyptic number.

It is an amenable number.

7611661 is a deficient number, since it is larger than the sum of its proper divisors (1).

7611661 is an equidigital number, since it uses as much as digits as its factorization.

7611661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 28.

The square root of 7611661 is about 2758.9238844158. The cubic root of 7611661 is about 196.7100185321.

It can be divided in two parts, 761166 and 1, that added together give a palindrome (761167).

The spelling of 7611661 in words is "seven million, six hundred eleven thousand, six hundred sixty-one".