664225399398 has 32 divisors (see below), whose sum is σ = 1449255530880. Its totient is φ = 201275357760.

The previous prime is 664225399361. The next prime is 664225399447. The reversal of 664225399398 is 893993522466.

It is a happy number.

664225399398 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3154386 + ... + 3358362.

It is an arithmetic number, because the mean of its divisors is an integer number (45289235340).

Almost surely, 2^664225399398 is an apocalyptic number.

664225399398 is an abundant number, since it is smaller than the sum of its proper divisors (785030131482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664225399398 is a wasteful number, since it uses less digits than its factorization.

664225399398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253332.

The product of its digits is 151165440, while the sum is 66.

The spelling of 664225399398 in words is "six hundred sixty-four billion, two hundred twenty-five million, three hundred ninety-nine thousand, three hundred ninety-eight".