2887421665 has 4 divisors (see below), whose sum is σ = 3464906004. Its totient is φ = 2309937328.

The previous prime is 2887421653. The next prime is 2887421671. The reversal of 2887421665 is 5661247882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5661247882 = 2 ⋅2830623941.

It can be written as a sum of positive squares in 2 ways, for example, as 584285584 + 2303136081 = 24172^2 + 47991^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2887421665 is a prime.

It is a super-2 number, since 2×2887421665² = 16674407743022744450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) 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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288742162 + ... + 288742171.

It is an arithmetic number, because the mean of its divisors is an integer number (866226501).

Almost surely, 2^2887421665 is an apocalyptic number.

It is an amenable number.

2887421665 is a deficient number, since it is larger than the sum of its proper divisors (577484339).

2887421665 is an equidigital number, since it uses as much as digits as its factorization.

2887421665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577484338.

The product of its digits is 1290240, while the sum is 49.

The square root of 2887421665 is about 53734.7342507619. The cubic root of 2887421665 is about 1423.9784063934.

The spelling of 2887421665 in words is "two billion, eight hundred eighty-seven million, four hundred twenty-one thousand, six hundred sixty-five".