647777347563 has 4 divisors (see below), whose sum is σ = 863703130088. Its totient is φ = 431851565040.

The previous prime is 647777347561. The next prime is 647777347589. The reversal of 647777347563 is 365743777746.

It is a happy number.

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

It is not a de Polignac number, because 647777347563 - 2¹ = 647777347561 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 647777347494 and 647777347503.

It is not an unprimeable number, because it can be changed into a prime (647777347561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107962891258 + ... + 107962891263.

It is an arithmetic number, because the mean of its divisors is an integer number (215925782522).

Almost surely, 2^647777347563 is an apocalyptic number.

647777347563 is a deficient number, since it is larger than the sum of its proper divisors (215925782525).

647777347563 is a wasteful number, since it uses less digits than its factorization.

647777347563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215925782524.

The product of its digits is 435637440, while the sum is 66.

The spelling of 647777347563 in words is "six hundred forty-seven billion, seven hundred seventy-seven million, three hundred forty-seven thousand, five hundred sixty-three".