664512398 has 32 divisors (see below), whose sum is σ = 1115216640. Its totient is φ = 296861400.

The previous prime is 664512397. The next prime is 664512413. The reversal of 664512398 is 893215466.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664512397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154943 + ... + 159173.

It is an arithmetic number, because the mean of its divisors is an integer number (34850520).

Almost surely, 2^664512398 is an apocalyptic number.

664512398 is a deficient number, since it is larger than the sum of its proper divisors (450704242).

664512398 is a wasteful number, since it uses less digits than its factorization.

664512398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4325 (or 4303 counting only the distinct ones).

The product of its digits is 311040, while the sum is 44.

The square root of 664512398 is about 25778.1379855101. The cubic root of 664512398 is about 872.6384858572.

The spelling of 664512398 in words is "six hundred sixty-four million, five hundred twelve thousand, three hundred ninety-eight".