2664678217 has 4 divisors (see below), whose sum is σ = 2664818560. Its totient is φ = 2664537876.

The previous prime is 2664678157. The next prime is 2664678221. The reversal of 2664678217 is 7128764662.

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 2664678217 - 2⁷ = 2664678089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2664678287) 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, 36213 + ... + 81490.

It is an arithmetic number, because the mean of its divisors is an integer number (666204640).

Almost surely, 2^2664678217 is an apocalyptic number.

It is an amenable number.

2664678217 is a deficient number, since it is larger than the sum of its proper divisors (140343).

2664678217 is a wasteful number, since it uses less digits than its factorization.

2664678217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140342.

The product of its digits is 1354752, while the sum is 49.

The square root of 2664678217 is about 51620.5212778794. The cubic root of 2664678217 is about 1386.3777844951.

The spelling of 2664678217 in words is "two billion, six hundred sixty-four million, six hundred seventy-eight thousand, two hundred seventeen".