646115511647 has 8 divisors (see below), whose sum is σ = 646942630656. Its totient is φ = 645288557472.

The previous prime is 646115511637. The next prime is 646115511721. The reversal of 646115511647 is 746115511646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 646115511647 - 2¹⁶ = 646115446111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646115511637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9080573 + ... + 9151449.

It is an arithmetic number, because the mean of its divisors is an integer number (80867828832).

Almost surely, 2^646115511647 is an apocalyptic number.

646115511647 is a deficient number, since it is larger than the sum of its proper divisors (827119009).

646115511647 is a wasteful number, since it uses less digits than its factorization.

646115511647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82417.

The product of its digits is 604800, while the sum is 47.

Subtracting 646115511647 from its reverse (746115511646), we obtain a palindrome (99999999999).

The spelling of 646115511647 in words is "six hundred forty-six billion, one hundred fifteen million, five hundred eleven thousand, six hundred forty-seven".