667651655 has 16 divisors (see below), whose sum is σ = 878559264. Its totient is φ = 483041280.

The previous prime is 667651651. The next prime is 667651703. The reversal of 667651655 is 556156766.

It is not a de Polignac number, because 667651655 - 2² = 667651651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667651651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20834 + ... + 42063.

It is an arithmetic number, because the mean of its divisors is an integer number (54909954).

Almost surely, 2^667651655 is an apocalyptic number.

667651655 is a deficient number, since it is larger than the sum of its proper divisors (210907609).

667651655 is a wasteful number, since it uses less digits than its factorization.

667651655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63106.

The product of its digits is 1134000, while the sum is 47.

The square root of 667651655 is about 25838.9561515166. The cubic root of 667651655 is about 874.0104863057.

The spelling of 667651655 in words is "six hundred sixty-seven million, six hundred fifty-one thousand, six hundred fifty-five".