647224555 has 4 divisors (see below), whose sum is σ = 776669472. Its totient is φ = 517779640.

The previous prime is 647224553. The next prime is 647224559. The reversal of 647224555 is 555422746.

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

It is not a de Polignac number, because 647224555 - 2¹ = 647224553 is a prime.

It is a Smith number, since the sum of its digits (40) 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 not an unprimeable number, because it can be changed into a prime (647224553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64722451 + ... + 64722460.

It is an arithmetic number, because the mean of its divisors is an integer number (194167368).

Almost surely, 2^647224555 is an apocalyptic number.

647224555 is a deficient number, since it is larger than the sum of its proper divisors (129444917).

647224555 is a wasteful number, since it uses less digits than its factorization.

647224555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129444916.

The product of its digits is 336000, while the sum is 40.

The square root of 647224555 is about 25440.6083850210. The cubic root of 647224555 is about 865.0044237804.

The spelling of 647224555 in words is "six hundred forty-seven million, two hundred twenty-four thousand, five hundred fifty-five".