644546066603260 has 48 divisors (see below), whose sum is σ = 1354675050086400. Its totient is φ = 257603579164224.

The previous prime is 644546066603113. The next prime is 644546066603261. The reversal of 644546066603260 is 62306660645446.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 644546066603195 and 644546066603204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644546066603261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148065349 + ... + 152356291.

It is an arithmetic number, because the mean of its divisors is an integer number (28222396876800).

Almost surely, 2^{644546066603260} is an apocalyptic number.

It is an amenable number.

644546066603260 is an abundant number, since it is smaller than the sum of its proper divisors (710128983483140).

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

644546066603260 is a wasteful number, since it uses less digits than its factorization.

644546066603260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4297210 (or 4297208 counting only the distinct ones).

The product of its (nonzero) digits is 89579520, while the sum is 58.

The spelling of 644546066603260 in words is "six hundred forty-four trillion, five hundred forty-six billion, sixty-six million, six hundred three thousand, two hundred sixty".