647564643811 has 16 divisors (see below), whose sum is σ = 665759001600. Its totient is φ = 629619395328.

The previous prime is 647564643809. The next prime is 647564643851. The reversal of 647564643811 is 118346465746.

It is a cyclic number.

It is not a de Polignac number, because 647564643811 - 2¹ = 647564643809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (647564643851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9023770 + ... + 9095248.

It is an arithmetic number, because the mean of its divisors is an integer number (41609937600).

Almost surely, 2^647564643811 is an apocalyptic number.

647564643811 is a deficient number, since it is larger than the sum of its proper divisors (18194357789).

647564643811 is a wasteful number, since it uses less digits than its factorization.

647564643811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73218.

The product of its digits is 11612160, while the sum is 55.

The spelling of 647564643811 in words is "six hundred forty-seven billion, five hundred sixty-four million, six hundred forty-three thousand, eight hundred eleven".