664798361 has 4 divisors (see below), whose sum is σ = 680258832. Its totient is φ = 649337892.

The previous prime is 664798331. The next prime is 664798363. The reversal of 664798361 is 163897466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 163897466 = 2 ⋅81948733.

It is a cyclic number.

It is not a de Polignac number, because 664798361 - 2¹⁴ = 664781977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664798363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7730171 + ... + 7730256.

It is an arithmetic number, because the mean of its divisors is an integer number (170064708).

Almost surely, 2^664798361 is an apocalyptic number.

It is an amenable number.

664798361 is a deficient number, since it is larger than the sum of its proper divisors (15460471).

664798361 is a wasteful number, since it uses less digits than its factorization.

664798361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15460470.

The product of its digits is 1306368, while the sum is 50.

The square root of 664798361 is about 25783.6840075269. The cubic root of 664798361 is about 872.7636435583.

The spelling of 664798361 in words is "six hundred sixty-four million, seven hundred ninety-eight thousand, three hundred sixty-one".