667934661 has 4 divisors (see below), whose sum is σ = 890579552. Its totient is φ = 445289772.

The previous prime is 667934653. The next prime is 667934713. The reversal of 667934661 is 166439766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 667934661 - 2³ = 667934653 is a prime.

It is a super-2 number, since 2×667934661² = 892273422730369842, which contains 22 as substring.

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 667934661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667934161) 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, 111322441 + ... + 111322446.

It is an arithmetic number, because the mean of its divisors is an integer number (222644888).

Almost surely, 2^667934661 is an apocalyptic number.

It is an amenable number.

667934661 is a deficient number, since it is larger than the sum of its proper divisors (222644891).

667934661 is a wasteful number, since it uses less digits than its factorization.

667934661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222644890.

The product of its digits is 979776, while the sum is 48.

The square root of 667934661 is about 25844.4319148245. The cubic root of 667934661 is about 874.1339615086.

The spelling of 667934661 in words is "six hundred sixty-seven million, nine hundred thirty-four thousand, six hundred sixty-one".