2421642665 has 8 divisors (see below), whose sum is σ = 3129507528. Its totient is φ = 1788289920.

The previous prime is 2421642659. The next prime is 2421642667. The reversal of 2421642665 is 5662461242.

It can be written as a sum of positive squares in 4 ways, for example, as 136515856 + 2285126809 = 11684^2 + 47803^2 .

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

It is not a de Polignac number, because 2421642665 - 2²⁰ = 2420594089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2421642667) 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, 18627956 + ... + 18628085.

It is an arithmetic number, because the mean of its divisors is an integer number (391188441).

Almost surely, 2^2421642665 is an apocalyptic number.

It is an amenable number.

2421642665 is a deficient number, since it is larger than the sum of its proper divisors (707864863).

2421642665 is a wasteful number, since it uses less digits than its factorization.

2421642665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37256059.

The product of its digits is 138240, while the sum is 38.

The square root of 2421642665 is about 49210.1886299982. The cubic root of 2421642665 is about 1342.8783943774.

The spelling of 2421642665 in words is "two billion, four hundred twenty-one million, six hundred forty-two thousand, six hundred sixty-five".