667602823 has 4 divisors (see below), whose sum is σ = 690623640. Its totient is φ = 644582008.

The previous prime is 667602797. The next prime is 667602827. The reversal of 667602823 is 328206766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 667602823 - 2¹⁷ = 667471751 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667602827) 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, 11510365 + ... + 11510422.

It is an arithmetic number, because the mean of its divisors is an integer number (172655910).

Almost surely, 2^667602823 is an apocalyptic number.

667602823 is a deficient number, since it is larger than the sum of its proper divisors (23020817).

667602823 is a wasteful number, since it uses less digits than its factorization.

667602823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23020816.

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 667602823 is about 25838.0112044252. The cubic root of 667602823 is about 873.9891774288.

The spelling of 667602823 in words is "six hundred sixty-seven million, six hundred two thousand, eight hundred twenty-three".