644626045166 has 8 divisors (see below), whose sum is σ = 967084776840. Its totient is φ = 322264452888.

The previous prime is 644626045123. The next prime is 644626045177. The reversal of 644626045166 is 661540626446.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24268256 + ... + 24294803.

It is an arithmetic number, because the mean of its divisors is an integer number (120885597105).

Almost surely, 2^644626045166 is an apocalyptic number.

644626045166 is a deficient number, since it is larger than the sum of its proper divisors (322458731674).

644626045166 is a wasteful number, since it uses less digits than its factorization.

644626045166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48569698.

The product of its (nonzero) digits is 4976640, while the sum is 50.

The spelling of 644626045166 in words is "six hundred forty-four billion, six hundred twenty-six million, forty-five thousand, one hundred sixty-six".