2665044521 has 4 divisors (see below), whose sum is σ = 2676682500. Its totient is φ = 2653406544.

The previous prime is 2665044509. The next prime is 2665044541. The reversal of 2665044521 is 1254405662.

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 2360890921 + 304153600 = 48589^2 + 17440^2 .

It is a cyclic number.

It is not a de Polignac number, because 2665044521 - 2¹⁰ = 2665043497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2665044541) 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 3 ways as a sum of consecutive naturals, for example, 5818646 + ... + 5819103.

It is an arithmetic number, because the mean of its divisors is an integer number (669170625).

Almost surely, 2^2665044521 is an apocalyptic number.

It is an amenable number.

2665044521 is a deficient number, since it is larger than the sum of its proper divisors (11637979).

2665044521 is a wasteful number, since it uses less digits than its factorization.

2665044521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11637978.

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 2665044521 is about 51624.0692022626. The cubic root of 2665044521 is about 1386.4413084203.

The spelling of 2665044521 in words is "two billion, six hundred sixty-five million, forty-four thousand, five hundred twenty-one".