664353893 has 4 divisors (see below), whose sum is σ = 759261600. Its totient is φ = 569446188.

The previous prime is 664353871. The next prime is 664353923. The reversal of 664353893 is 398353466.

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.

It is a cyclic number.

It is not a de Polignac number, because 664353893 - 2¹⁶ = 664288357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664353853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47453843 + ... + 47453856.

It is an arithmetic number, because the mean of its divisors is an integer number (189815400).

Almost surely, 2^664353893 is an apocalyptic number.

It is an amenable number.

664353893 is a deficient number, since it is larger than the sum of its proper divisors (94907707).

664353893 is an equidigital number, since it uses as much as digits as its factorization.

664353893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94907706.

The product of its digits is 1399680, while the sum is 47.

The square root of 664353893 is about 25775.0633946844. The cubic root of 664353893 is about 872.5690973539.

The spelling of 664353893 in words is "six hundred sixty-four million, three hundred fifty-three thousand, eight hundred ninety-three".