664546771 has 24 divisors (see below), whose sum is σ = 797587776. Its totient is φ = 551779200.

The previous prime is 664546741. The next prime is 664546789. The reversal of 664546771 is 177645466.

It is not a de Polignac number, because 664546771 - 2¹¹ = 664544723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664546741) 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 23 ways as a sum of consecutive naturals, for example, 231175 + ... + 234031.

It is an arithmetic number, because the mean of its divisors is an integer number (33232824).

Almost surely, 2^664546771 is an apocalyptic number.

664546771 is a deficient number, since it is larger than the sum of its proper divisors (133041005).

664546771 is a wasteful number, since it uses less digits than its factorization.

664546771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3019 (or 3012 counting only the distinct ones).

The product of its digits is 846720, while the sum is 46.

The square root of 664546771 is about 25778.8046852448. The cubic root of 664546771 is about 872.6535318196.

The spelling of 664546771 in words is "six hundred sixty-four million, five hundred forty-six thousand, seven hundred seventy-one".