667653 has 8 divisors (see below), whose sum is σ = 1017408. Its totient is φ = 381504.

The previous prime is 667649. The next prime is 667657. The reversal of 667653 is 356766.

It is an interprime number because it is at equal distance from previous prime (667649) and next prime (667657).

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

It is not a de Polignac number, because 667653 - 2² = 667649 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667657) 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, 15876 + ... + 15917.

It is an arithmetic number, because the mean of its divisors is an integer number (127176).

2⁶⁶⁷⁶⁵³ is an apocalyptic number.

It is an amenable number.

667653 is a deficient number, since it is larger than the sum of its proper divisors (349755).

667653 is a wasteful number, since it uses less digits than its factorization.

667653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31803.

The product of its digits is 22680, while the sum is 33.

The square root of 667653 is about 817.1003610328. The cubic root of 667653 is about 87.4011073210.

The spelling of 667653 in words is "six hundred sixty-seven thousand, six hundred fifty-three".