667855651 has 12 divisors (see below), whose sum is σ = 683123112. Its totient is φ = 652876224.

The previous prime is 667855631. The next prime is 667855667. The reversal of 667855651 is 156558766.

It is not a de Polignac number, because 667855651 - 2¹¹ = 667853603 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 667855595 and 667855604.

It is not an unprimeable number, because it can be changed into a prime (667855631) 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 11 ways as a sum of consecutive naturals, for example, 704760 + ... + 705706.

It is an arithmetic number, because the mean of its divisors is an integer number (56926926).

Almost surely, 2^667855651 is an apocalyptic number.

667855651 is a deficient number, since it is larger than the sum of its proper divisors (15267461).

667855651 is an equidigital number, since it uses as much as digits as its factorization.

667855651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1218 (or 1139 counting only the distinct ones).

The product of its digits is 1512000, while the sum is 49.

The square root of 667855651 is about 25842.9033005195. The cubic root of 667855651 is about 874.0994930435.

The spelling of 667855651 in words is "six hundred sixty-seven million, eight hundred fifty-five thousand, six hundred fifty-one".