644162011 has 8 divisors (see below), whose sum is σ = 685591344. Its totient is φ = 603125760.

The previous prime is 644162009. The next prime is 644162027. The reversal of 644162011 is 110261446.

644162011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 644162011 - 2¹ = 644162009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (644162411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94885 + ... + 101446.

It is an arithmetic number, because the mean of its divisors is an integer number (85698918).

Almost surely, 2^644162011 is an apocalyptic number.

644162011 is a deficient number, since it is larger than the sum of its proper divisors (41429333).

644162011 is a wasteful number, since it uses less digits than its factorization.

644162011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196541.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 644162011 is about 25380.3469440431. The cubic root of 644162011 is about 863.6379204676.

The spelling of 644162011 in words is "six hundred forty-four million, one hundred sixty-two thousand, eleven".