667941564 has 12 divisors (see below), whose sum is σ = 1558530344. Its totient is φ = 222647184.

The previous prime is 667941557. The next prime is 667941569. The reversal of 667941564 is 465149766.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×667941564³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667941569) 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, 27830887 + ... + 27830910.

Almost surely, 2^667941564 is an apocalyptic number.

It is an amenable number.

667941564 is an abundant number, since it is smaller than the sum of its proper divisors (890588780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667941564 is a wasteful number, since it uses less digits than its factorization.

667941564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55661804 (or 55661802 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 48.

The square root of 667941564 is about 25844.5654635554. The cubic root of 667941564 is about 874.1369728440.

The spelling of 667941564 in words is "six hundred sixty-seven million, nine hundred forty-one thousand, five hundred sixty-four".