646722227646 has 64 divisors (see below), whose sum is σ = 1597392887040. Its totient is φ = 192278754720.

The previous prime is 646722227623. The next prime is 646722227647.

646722227646 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 646722227592 and 646722227601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646722227647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10239820 + ... + 10302783.

It is an arithmetic number, because the mean of its divisors is an integer number (24959263860).

Almost surely, 2^646722227646 is an apocalyptic number.

646722227646 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

646722227646 is an abundant number, since it is smaller than the sum of its proper divisors (950670659394).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646722227646 is a wasteful number, since it uses less digits than its factorization.

646722227646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20542678 (or 20542672 counting only the distinct ones).

The product of its digits is 16257024, while the sum is 54.

The spelling of 646722227646 in words is "six hundred forty-six billion, seven hundred twenty-two million, two hundred twenty-seven thousand, six hundred forty-six".