2456664647 has 4 divisors (see below), whose sum is σ = 2458545576. Its totient is φ = 2454783720.

The previous prime is 2456664629. The next prime is 2456664671. The reversal of 2456664647 is 7464666542.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2456664647 - 2²⁰ = 2455616071 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2456664595 and 2456664604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2456664677) 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, 938504 + ... + 941117.

It is an arithmetic number, because the mean of its divisors is an integer number (614636394).

Almost surely, 2^2456664647 is an apocalyptic number.

2456664647 is a deficient number, since it is larger than the sum of its proper divisors (1880929).

2456664647 is a wasteful number, since it uses less digits than its factorization.

2456664647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1880928.

The product of its digits is 5806080, while the sum is 50.

The square root of 2456664647 is about 49564.7520623275. The cubic root of 2456664647 is about 1349.3210389229.

The spelling of 2456664647 in words is "two billion, four hundred fifty-six million, six hundred sixty-four thousand, six hundred forty-seven".