664654363 has 4 divisors (see below), whose sum is σ = 664936360. Its totient is φ = 664372368.

The previous prime is 664654357. The next prime is 664654369. The reversal of 664654363 is 363456466.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 363456466 = 2 ⋅181728233.

It is an interprime number because it is at equal distance from previous prime (664654357) and next prime (664654369).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664654363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664654369) 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 3 ways as a sum of consecutive naturals, for example, 137433 + ... + 142186.

It is an arithmetic number, because the mean of its divisors is an integer number (166234090).

Almost surely, 2^664654363 is an apocalyptic number.

664654363 is a deficient number, since it is larger than the sum of its proper divisors (281997).

664654363 is a wasteful number, since it uses less digits than its factorization.

664654363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281996.

The product of its digits is 933120, while the sum is 43.

The square root of 664654363 is about 25780.8914314459. The cubic root of 664654363 is about 872.7006243024.

It can be divided in two parts, 6646 and 54363, that added together give a square (61009 = 247²).

The spelling of 664654363 in words is "six hundred sixty-four million, six hundred fifty-four thousand, three hundred sixty-three".