667929109 has 8 divisors (see below), whose sum is σ = 671906360. Its totient is φ = 663961536.

The previous prime is 667929083. The next prime is 667929127. The reversal of 667929109 is 901929766.

It can be written as a sum of positive squares in 4 ways, for example, as 506385009 + 161544100 = 22503^2 + 12710^2 .

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 667929109 - 2¹⁹ = 667404821 is a prime.

It is a super-2 number, since 2×667929109² = 892258589299067762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667929169) 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 7 ways as a sum of consecutive naturals, for example, 171427 + ... + 175279.

It is an arithmetic number, because the mean of its divisors is an integer number (83988295).

Almost surely, 2^667929109 is an apocalyptic number.

It is an amenable number.

667929109 is a deficient number, since it is larger than the sum of its proper divisors (3977251).

667929109 is a wasteful number, since it uses less digits than its factorization.

667929109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4839.

The product of its (nonzero) digits is 367416, while the sum is 49.

The square root of 667929109 is about 25844.3245026834. The cubic root of 667929109 is about 874.1315395126.

The spelling of 667929109 in words is "six hundred sixty-seven million, nine hundred twenty-nine thousand, one hundred nine".