664672216392 has 60 divisors (see below), whose sum is σ = 1861755773955. Its totient is φ = 221550487632.

The previous prime is 664672216387. The next prime is 664672216399. The reversal of 664672216392 is 293612276466.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

664672216392 is a `hidden beast` number, since 66 + 467 + 22 + 16 + 3 + 92 = 666.

It can be written as a sum of positive squares in only one way, i.e., 332336108196 + 332336108196 = 576486^2 + 576486^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=576486.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (664672216399) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 20737483 + ... + 20769509.

Almost surely, 2^664672216392 is an apocalyptic number.

It is an amenable number.

664672216392 is an abundant number, since it is smaller than the sum of its proper divisors (1197083557563).

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

664672216392 is an frugal number, since it uses more digits than its factorization.

664672216392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64072 (or 32032 counting only the distinct ones).

The product of its digits is 7838208, while the sum is 54.

The spelling of 664672216392 in words is "six hundred sixty-four billion, six hundred seventy-two million, two hundred sixteen thousand, three hundred ninety-two".