664461234252 has 72 divisors (see below), whose sum is σ = 1872011559600. Its totient is φ = 197486926848.

The previous prime is 664461234131. The next prime is 664461234257. The reversal of 664461234252 is 252432164466.

It is a happy number.

664461234252 is a `hidden beast` number, since 6 + 6 + 4 + 4 + 612 + 3 + 4 + 25 + 2 = 666.

664461234252 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 664461234198 and 664461234207.

It is not an unprimeable number, because it can be changed into a prime (664461234257) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28559977 + ... + 28583232.

It is an arithmetic number, because the mean of its divisors is an integer number (26000160550).

Almost surely, 2^664461234252 is an apocalyptic number.

It is an amenable number.

664461234252 is an abundant number, since it is smaller than the sum of its proper divisors (1207550325348).

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

664461234252 is a wasteful number, since it uses less digits than its factorization.

664461234252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57143255 (or 57143250 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 45.

The spelling of 664461234252 in words is "six hundred sixty-four billion, four hundred sixty-one million, two hundred thirty-four thousand, two hundred fifty-two".