7541165621 has 16 divisors (see below), whose sum is σ = 8279392320. Its totient is φ = 6811806720.

The previous prime is 7541165587. The next prime is 7541165623. The reversal of 7541165621 is 1265611457.

It is a cyclic number.

It is not a de Polignac number, because 7541165621 - 2¹⁰ = 7541164597 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 (7541165623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2352806 + ... + 2356008.

It is an arithmetic number, because the mean of its divisors is an integer number (517462020).

Almost surely, 2^7541165621 is an apocalyptic number.

It is an amenable number.

7541165621 is a deficient number, since it is larger than the sum of its proper divisors (738226699).

7541165621 is a wasteful number, since it uses less digits than its factorization.

7541165621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4516.

The product of its digits is 50400, while the sum is 38.

The square root of 7541165621 is about 86839.8849665291. The cubic root of 7541165621 is about 1961.0085761736.

The spelling of 7541165621 in words is "seven billion, five hundred forty-one million, one hundred sixty-five thousand, six hundred twenty-one".