664343355 has 64 divisors (see below), whose sum is σ = 1178634240. Its totient is φ = 317492736.

The previous prime is 664343353. The next prime is 664343359. The reversal of 664343355 is 553343466.

It is not a de Polignac number, because 664343355 - 2¹ = 664343353 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (664343353) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1585336 + ... + 1585754.

It is an arithmetic number, because the mean of its divisors is an integer number (18416160).

Almost surely, 2^664343355 is an apocalyptic number.

664343355 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

664343355 is a deficient number, since it is larger than the sum of its proper divisors (514290885).

664343355 is a wasteful number, since it uses less digits than its factorization.

664343355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660.

The product of its digits is 388800, while the sum is 39.

The square root of 664343355 is about 25774.8589714861. The cubic root of 664343355 is about 872.5644837577.

The spelling of 664343355 in words is "six hundred sixty-four million, three hundred forty-three thousand, three hundred fifty-five".