664838814025 has 48 divisors (see below), whose sum is σ = 845982014400. Its totient is φ = 518131093760.

The previous prime is 664838814023. The next prime is 664838814043. The reversal of 664838814025 is 520418838466.

It is not a de Polignac number, because 664838814025 - 2¹ = 664838814023 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664838814023) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 80886366 + ... + 80894584.

It is an arithmetic number, because the mean of its divisors is an integer number (17624625300).

Almost surely, 2^664838814025 is an apocalyptic number.

It is an amenable number.

664838814025 is a deficient number, since it is larger than the sum of its proper divisors (181143200375).

664838814025 is a wasteful number, since it uses less digits than its factorization.

664838814025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8778 (or 8773 counting only the distinct ones).

The product of its (nonzero) digits is 8847360, while the sum is 55.

The spelling of 664838814025 in words is "six hundred sixty-four billion, eight hundred thirty-eight million, eight hundred fourteen thousand, twenty-five".