646554455647 has 24 divisors (see below), whose sum is σ = 678066480000. Its totient is φ = 616453448688.

The previous prime is 646554455551. The next prime is 646554455683. The reversal of 646554455647 is 746554455646.

646554455647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 646554455647 - 2²⁷ = 646420237919 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 (646554455147) 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, 414723054 + ... + 414724612.

It is an arithmetic number, because the mean of its divisors is an integer number (28252770000).

Almost surely, 2^646554455647 is an apocalyptic number.

646554455647 is a deficient number, since it is larger than the sum of its proper divisors (31512024353).

646554455647 is a wasteful number, since it uses less digits than its factorization.

646554455647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3627 (or 3604 counting only the distinct ones).

The product of its digits is 241920000, while the sum is 61.

Subtracting 646554455647 from its reverse (746554455646), we obtain a palindrome (99999999999).

The spelling of 646554455647 in words is "six hundred forty-six billion, five hundred fifty-four million, four hundred fifty-five thousand, six hundred forty-seven".