664565501222772 has 48 divisors (see below), whose sum is σ = 1550910865008960. Its totient is φ = 221484973967872.

The previous prime is 664565501222713. The next prime is 664565501222773. The reversal of 664565501222772 is 277222105565466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664565501222773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6963930754 + ... + 6964026182.

It is an arithmetic number, because the mean of its divisors is an integer number (32310643021020).

Almost surely, 2^{664565501222772} is an apocalyptic number.

It is an amenable number.

664565501222772 is an abundant number, since it is smaller than the sum of its proper divisors (886345363786188).

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

664565501222772 is a wasteful number, since it uses less digits than its factorization.

664565501222772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185920 (or 185918 counting only the distinct ones).

The product of its (nonzero) digits is 84672000, while the sum is 60.

The spelling of 664565501222772 in words is "six hundred sixty-four trillion, five hundred sixty-five billion, five hundred one million, two hundred twenty-two thousand, seven hundred seventy-two".