664149344 has 12 divisors (see below), whose sum is σ = 1307544084. Its totient is φ = 332074656.

The previous prime is 664149341. The next prime is 664149347. The reversal of 664149344 is 443941466.

It is an interprime number because it is at equal distance from previous prime (664149341) and next prime (664149347).

It is a super-2 number, since 2×664149344² = 882188702271260672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664149341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10377302 + ... + 10377365.

It is an arithmetic number, because the mean of its divisors is an integer number (108962007).

Almost surely, 2^664149344 is an apocalyptic number.

It is an amenable number.

664149344 is a deficient number, since it is larger than the sum of its proper divisors (643394740).

664149344 is a wasteful number, since it uses less digits than its factorization.

664149344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20754677 (or 20754669 counting only the distinct ones).

The product of its digits is 248832, while the sum is 41.

The square root of 664149344 is about 25771.0951261292. The cubic root of 664149344 is about 872.4795359223.

The spelling of 664149344 in words is "six hundred sixty-four million, one hundred forty-nine thousand, three hundred forty-four".