2445666521 has 8 divisors (see below), whose sum is σ = 2555808000. Its totient is φ = 2335842432.

The previous prime is 2445666469. The next prime is 2445666551. The reversal of 2445666521 is 1256665442.

2445666521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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-2445666521 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 (2445666551) 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, 63521 + ... + 94478.

It is an arithmetic number, because the mean of its divisors is an integer number (319476000).

Almost surely, 2^2445666521 is an apocalyptic number.

It is an amenable number.

2445666521 is a deficient number, since it is larger than the sum of its proper divisors (110141479).

2445666521 is a wasteful number, since it uses less digits than its factorization.

2445666521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158695.

The product of its digits is 345600, while the sum is 41.

The square root of 2445666521 is about 49453.6805607025. The cubic root of 2445666521 is about 1347.3044560511.

The spelling of 2445666521 in words is "two billion, four hundred forty-five million, six hundred sixty-six thousand, five hundred twenty-one".