7156665605 has 4 divisors (see below), whose sum is σ = 8587998732. Its totient is φ = 5725332480.

The previous prime is 7156665601. The next prime is 7156665619. The reversal of 7156665605 is 5065666517.

7156665605 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4456096516 + 2700569089 = 66754^2 + 51967^2 .

It is not a de Polignac number, because 7156665605 - 2² = 7156665601 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7156665605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7156665601) 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 in 3 ways as a sum of consecutive naturals, for example, 715666556 + ... + 715666565.

It is an arithmetic number, because the mean of its divisors is an integer number (2146999683).

Almost surely, 2^7156665605 is an apocalyptic number.

It is an amenable number.

7156665605 is a deficient number, since it is larger than the sum of its proper divisors (1431333127).

7156665605 is a wasteful number, since it uses less digits than its factorization.

7156665605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431333126.

The product of its (nonzero) digits is 1134000, while the sum is 47.

The square root of 7156665605 is about 84597.0779932735. The cubic root of 7156665605 is about 1927.0969990007.

The spelling of 7156665605 in words is "seven billion, one hundred fifty-six million, six hundred sixty-five thousand, six hundred five".