664764806547 has 32 divisors (see below), whose sum is σ = 1003917499200. Its totient is φ = 434598518016.

The previous prime is 664764806501. The next prime is 664764806591. The reversal of 664764806547 is 745608467466.

It is a happy number.

664764806547 is a `hidden beast` number, since 6 + 6 + 4 + 7 + 6 + 4 + 80 + 6 + 547 = 666.

It is not a de Polignac number, because 664764806547 - 2¹¹ = 664764804499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664764806947) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2789023 + ... + 3017975.

It is an arithmetic number, because the mean of its divisors is an integer number (31372421850).

Almost surely, 2^664764806547 is an apocalyptic number.

664764806547 is a deficient number, since it is larger than the sum of its proper divisors (339152692653).

664764806547 is a wasteful number, since it uses less digits than its factorization.

664764806547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231044 (or 231038 counting only the distinct ones).

The product of its (nonzero) digits is 162570240, while the sum is 63.

The spelling of 664764806547 in words is "six hundred sixty-four billion, seven hundred sixty-four million, eight hundred six thousand, five hundred forty-seven".