644548417406 has 8 divisors (see below), whose sum is σ = 967083870024. Its totient is φ = 322187127400.

The previous prime is 644548417367. The next prime is 644548417421. The reversal of 644548417406 is 604714845446.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43531400 + ... + 43546203.

It is an arithmetic number, because the mean of its divisors is an integer number (120885483753).

Almost surely, 2^644548417406 is an apocalyptic number.

644548417406 is a deficient number, since it is larger than the sum of its proper divisors (322535452618).

644548417406 is a wasteful number, since it uses less digits than its factorization.

644548417406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87081306.

The product of its (nonzero) digits is 10321920, while the sum is 53.

The spelling of 644548417406 in words is "six hundred forty-four billion, five hundred forty-eight million, four hundred seventeen thousand, four hundred six".