667400671 has 8 divisors (see below), whose sum is σ = 807611040. Its totient is φ = 538407168.

The previous prime is 667400663. The next prime is 667400677. The reversal of 667400671 is 176004766.

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

It is a cyclic number.

It is not a de Polignac number, because 667400671 - 2³ = 667400663 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 667400671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667400677) 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, 2804086 + ... + 2804323.

It is an arithmetic number, because the mean of its divisors is an integer number (100951380).

Almost surely, 2^667400671 is an apocalyptic number.

667400671 is a deficient number, since it is larger than the sum of its proper divisors (140210369).

667400671 is a wasteful number, since it uses less digits than its factorization.

667400671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5608433.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 667400671 is about 25834.0989972555. The cubic root of 667400671 is about 873.9009530685.

The spelling of 667400671 in words is "six hundred sixty-seven million, four hundred thousand, six hundred seventy-one".