647771243273 has 16 divisors (see below), whose sum is σ = 807839830656. Its totient is φ = 504613731840.

The previous prime is 647771243269. The next prime is 647771243321. The reversal of 647771243273 is 372342177746.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 647771243273 - 2² = 647771243269 is a prime.

It is a super-2 number, since 2×647771243273² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (647771243573) 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 15 ways as a sum of consecutive naturals, for example, 918536 + ... + 1462617.

It is an arithmetic number, because the mean of its divisors is an integer number (50489989416).

Almost surely, 2^647771243273 is an apocalyptic number.

It is an amenable number.

647771243273 is a deficient number, since it is larger than the sum of its proper divisors (160068587383).

647771243273 is a wasteful number, since it uses less digits than its factorization.

647771243273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2384704.

The product of its digits is 8297856, while the sum is 53.

The spelling of 647771243273 in words is "six hundred forty-seven billion, seven hundred seventy-one million, two hundred forty-three thousand, two hundred seventy-three".