667220144 has 20 divisors (see below), whose sum is σ = 1314651720. Its totient is φ = 327955200.

The previous prime is 667220143. The next prime is 667220153. The reversal of 667220144 is 441022766.

667220144 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 667220144.

It is not an unprimeable number, because it can be changed into a prime (667220143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352457 + ... + 354344.

It is an arithmetic number, because the mean of its divisors is an integer number (65732586).

Almost surely, 2^667220144 is an apocalyptic number.

It is an amenable number.

667220144 is a deficient number, since it is larger than the sum of its proper divisors (647431576).

667220144 is a wasteful number, since it uses less digits than its factorization.

667220144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706868 (or 706862 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 667220144 is about 25830.6047935390. The cubic root of 667220144 is about 873.8221513576.

The spelling of 667220144 in words is "six hundred sixty-seven million, two hundred twenty thousand, one hundred forty-four".