646451154646 has 48 divisors (see below), whose sum is σ = 1074901403520. Its totient is φ = 291352089600.

The previous prime is 646451154617. The next prime is 646451154647.

646451154646 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 646451154593 and 646451154602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646451154647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18181366 + ... + 18216886.

It is an arithmetic number, because the mean of its divisors is an integer number (22393779240).

Almost surely, 2^646451154646 is an apocalyptic number.

646451154646 is a deficient number, since it is larger than the sum of its proper divisors (428450248874).

646451154646 is a wasteful number, since it uses less digits than its factorization.

646451154646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36181 (or 36170 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 52.

The spelling of 646451154646 in words is "six hundred forty-six billion, four hundred fifty-one million, one hundred fifty-four thousand, six hundred forty-six".