666552771 has 12 divisors (see below), whose sum is σ = 963053520. Its totient is φ = 444250800.

The previous prime is 666552727. The next prime is 666552781. The reversal of 666552771 is 177255666.

It is not a de Polignac number, because 666552771 - 2¹⁷ = 666421699 is a prime.

It is a super-3 number, since 3×666552771³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (666552701) 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 11 ways as a sum of consecutive naturals, for example, 38650 + ... + 53168.

It is an arithmetic number, because the mean of its divisors is an integer number (80254460).

Almost surely, 2^666552771 is an apocalyptic number.

666552771 is a deficient number, since it is larger than the sum of its proper divisors (296500749).

666552771 is a wasteful number, since it uses less digits than its factorization.

666552771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19626 (or 19623 counting only the distinct ones).

The product of its digits is 529200, while the sum is 45.

The square root of 666552771 is about 25817.6833004048. The cubic root of 666552771 is about 873.5307133883.

The spelling of 666552771 in words is "six hundred sixty-six million, five hundred fifty-two thousand, seven hundred seventy-one".