7145665405 has 8 divisors (see below), whose sum is σ = 8575284312. Its totient is φ = 5716208448.

The previous prime is 7145665393. The next prime is 7145665409. The reversal of 7145665405 is 5045665417.

It can be written as a sum of positive squares in 4 ways, for example, as 20448484 + 7125216921 = 4522^2 + 84411^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7145665405 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 (7145665409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102499 + ... + 157471.

It is an arithmetic number, because the mean of its divisors is an integer number (1071910539).

Almost surely, 2^7145665405 is an apocalyptic number.

It is an amenable number.

7145665405 is a deficient number, since it is larger than the sum of its proper divisors (1429618907).

7145665405 is a wasteful number, since it uses less digits than its factorization.

7145665405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80975.

The product of its (nonzero) digits is 504000, while the sum is 43.

The square root of 7145665405 is about 84532.0377430948. The cubic root of 7145665405 is about 1926.1091403182.

The spelling of 7145665405 in words is "seven billion, one hundred forty-five million, six hundred sixty-five thousand, four hundred five".