667430557 has 8 divisors (see below), whose sum is σ = 708734016. Its totient is φ = 626354112.

The previous prime is 667430549. The next prime is 667430609. The reversal of 667430557 is 755034766.

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 667430557 - 2³ = 667430549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667430857) 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, 50673 + ... + 62470.

It is an arithmetic number, because the mean of its divisors is an integer number (88591752).

Almost surely, 2^667430557 is an apocalyptic number.

It is an amenable number.

667430557 is a deficient number, since it is larger than the sum of its proper divisors (41303459).

667430557 is a wasteful number, since it uses less digits than its factorization.

667430557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113507.

The product of its (nonzero) digits is 529200, while the sum is 43.

The square root of 667430557 is about 25834.6774123464. The cubic root of 667430557 is about 873.9139972138.

The spelling of 667430557 in words is "six hundred sixty-seven million, four hundred thirty thousand, five hundred fifty-seven".