664199557 has 12 divisors (see below), whose sum is σ = 799284780. Its totient is φ = 549681216.

The previous prime is 664199519. The next prime is 664199567. The reversal of 664199557 is 755991466.

664199557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 216707841 + 447491716 = 14721^2 + 21154^2 .

It is a de Polignac number, because none of the positive numbers 2^k-664199557 is a prime.

It is a super-2 number, since 2×664199557² = 882322103037992498, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664199507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 232288 + ... + 235129.

It is an arithmetic number, because the mean of its divisors is an integer number (66607065).

Almost surely, 2^664199557 is an apocalyptic number.

It is an amenable number.

664199557 is a deficient number, since it is larger than the sum of its proper divisors (135085223).

664199557 is a wasteful number, since it uses less digits than its factorization.

664199557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467460 (or 467453 counting only the distinct ones).

The product of its digits is 2041200, while the sum is 52.

The square root of 664199557 is about 25772.0693193232. The cubic root of 664199557 is about 872.5015233017.

The spelling of 664199557 in words is "six hundred sixty-four million, one hundred ninety-nine thousand, five hundred fifty-seven".