664823586132 has 18 divisors (see below), whose sum is σ = 1680526287258. Its totient is φ = 221607862032.

The previous prime is 664823586079. The next prime is 664823586137. The reversal of 664823586132 is 231685328466.

664823586132 is a `hidden beast` number, since 6 + 6 + 4 + 8 + 23 + 586 + 1 + 32 = 666.

664823586132 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 594727846596 + 70095739536 = 771186^2 + 264756^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664823586137) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9233660883 + ... + 9233660954.

Almost surely, 2^664823586132 is an apocalyptic number.

It is an amenable number.

664823586132 is an abundant number, since it is smaller than the sum of its proper divisors (1015702701126).

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

664823586132 is a wasteful number, since it uses less digits than its factorization.

664823586132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18467321847 (or 18467321842 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 54.

The spelling of 664823586132 in words is "six hundred sixty-four billion, eight hundred twenty-three million, five hundred eighty-six thousand, one hundred thirty-two".