2665336621 has 4 divisors (see below), whose sum is σ = 2675955744. Its totient is φ = 2654717500.

The previous prime is 2665336613. The next prime is 2665336627. The reversal of 2665336621 is 1266335662.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2665336621 - 2³ = 2665336613 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2665336627) 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, 5309185 + ... + 5309686.

It is an arithmetic number, because the mean of its divisors is an integer number (668988936).

Almost surely, 2^2665336621 is an apocalyptic number.

It is an amenable number.

2665336621 is a deficient number, since it is larger than the sum of its proper divisors (10619123).

2665336621 is a wasteful number, since it uses less digits than its factorization.

2665336621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10619122.

The product of its digits is 233280, while the sum is 40.

The square root of 2665336621 is about 51626.8982314452. The cubic root of 2665336621 is about 1386.4919598207.

The spelling of 2665336621 in words is "two billion, six hundred sixty-five million, three hundred thirty-six thousand, six hundred twenty-one".