667400357 has 4 divisors (see below), whose sum is σ = 718738860. Its totient is φ = 616061856.

The previous prime is 667400347. The next prime is 667400359. The reversal of 667400357 is 753004766.

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

It can be written as a sum of positive squares in 2 ways, for example, as 340550116 + 326850241 = 18454^2 + 18079^2 .

It is a cyclic number.

It is not a de Polignac number, because 667400357 - 2⁴ = 667400341 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 667400357.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667400359) 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 3 ways as a sum of consecutive naturals, for example, 25669232 + ... + 25669257.

It is an arithmetic number, because the mean of its divisors is an integer number (179684715).

Almost surely, 2^667400357 is an apocalyptic number.

It is an amenable number.

667400357 is a deficient number, since it is larger than the sum of its proper divisors (51338503).

667400357 is a wasteful number, since it uses less digits than its factorization.

667400357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51338502.

The product of its (nonzero) digits is 105840, while the sum is 38.

The square root of 667400357 is about 25834.0929200156. The cubic root of 667400357 is about 873.9008160169.

The spelling of 667400357 in words is "six hundred sixty-seven million, four hundred thousand, three hundred fifty-seven".