647773606377747 has 24 divisors (see below), whose sum is σ = 937587844131120. Its totient is φ = 430965679479360.

The previous prime is 647773606377713. The next prime is 647773606377763. The reversal of 647773606377747 is 747773606377746.

647773606377747 is a `hidden beast` number, since 6 + 477 + 7 + 3 + 6 + 0 + 6 + 3 + 77 + 74 + 7 = 666.

It is not a de Polignac number, because 647773606377747 - 2¹⁰ = 647773606376723 is a prime.

It is a super-2 number, since 2×647773606377747² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (647773606377647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3799972 + ... + 36193742.

It is an arithmetic number, because the mean of its divisors is an integer number (39066160172130).

Almost surely, 2^{647773606377747} is an apocalyptic number.

647773606377747 is a deficient number, since it is larger than the sum of its proper divisors (289814237753373).

647773606377747 is a wasteful number, since it uses less digits than its factorization.

647773606377747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32398323 (or 32398320 counting only the distinct ones).

The product of its (nonzero) digits is 25615481472, while the sum is 81.

Subtracting 647773606377747 from its reverse (747773606377746), we obtain a palindrome (99999999999999).

The spelling of 647773606377747 in words is "six hundred forty-seven trillion, seven hundred seventy-three billion, six hundred six million, three hundred seventy-seven thousand, seven hundred forty-seven".