7611661109 has 4 divisors (see below), whose sum is σ = 8197173516. Its totient is φ = 7026148704.

The previous prime is 7611661097. The next prime is 7611661121. The reversal of 7611661109 is 9011661167.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (7611661097) and next prime (7611661121).

It can be written as a sum of positive squares in 2 ways, for example, as 1602000625 + 6009660484 = 40025^2 + 77522^2 .

It is a cyclic number.

It is not a de Polignac number, because 7611661109 - 2²⁴ = 7594883893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7611661159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 292756184 + ... + 292756209.

It is an arithmetic number, because the mean of its divisors is an integer number (2049293379).

Almost surely, 2^7611661109 is an apocalyptic number.

It is an amenable number.

7611661109 is a deficient number, since it is larger than the sum of its proper divisors (585512407).

7611661109 is a wasteful number, since it uses less digits than its factorization.

7611661109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585512406.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 7611661109 is about 87244.8342826095. The cubic root of 7611661109 is about 1967.1001947107.

The spelling of 7611661109 in words is "seven billion, six hundred eleven million, six hundred sixty-one thousand, one hundred nine".