666652917 has 8 divisors (see below), whose sum is σ = 1015852096. Its totient is φ = 380944512.

The previous prime is 666652913. The next prime is 666652927. The reversal of 666652917 is 719256666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 666652917 - 2² = 666652913 is a prime.

It is a super-2 number, since 2×666652917² = 888852223489217778, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666652913) 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, 15872668 + ... + 15872709.

It is an arithmetic number, because the mean of its divisors is an integer number (126981512).

Almost surely, 2^666652917 is an apocalyptic number.

It is an amenable number.

666652917 is a deficient number, since it is larger than the sum of its proper divisors (349199179).

666652917 is a wasteful number, since it uses less digits than its factorization.

666652917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31745387.

The product of its digits is 816480, while the sum is 48.

The square root of 666652917 is about 25819.6227121931. The cubic root of 666652917 is about 873.5744589749.

The spelling of 666652917 in words is "six hundred sixty-six million, six hundred fifty-two thousand, nine hundred seventeen".