646662462440 has 16 divisors (see below), whose sum is σ = 1454990540580. Its totient is φ = 258664984960.

The previous prime is 646662462437. The next prime is 646662462449. The reversal of 646662462440 is 44264266646.

It can be written as a sum of positive squares in 2 ways, for example, as 608003824516 + 38658637924 = 779746^2 + 196618^2 .

It is not an unprimeable number, because it can be changed into a prime (646662462449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8083280741 + ... + 8083280820.

Almost surely, 2^646662462440 is an apocalyptic number.

It is an amenable number.

646662462440 is an abundant number, since it is smaller than the sum of its proper divisors (808328078140).

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

646662462440 is a wasteful number, since it uses less digits than its factorization.

646662462440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16166561572 (or 16166561568 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 50.

The spelling of 646662462440 in words is "six hundred forty-six billion, six hundred sixty-two million, four hundred sixty-two thousand, four hundred forty".