664040344160550 has 48 divisors (see below), whose sum is σ = 1882080061166592. Its totient is φ = 151780650093600.

The previous prime is 664040344160503. The next prime is 664040344160551. The reversal of 664040344160550 is 55061443040466.

It is a self number, because there is not a number n which added to its sum of digits gives 664040344160550.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664040344160551) 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, 316209686646 + ... + 316209688745.

It is an arithmetic number, because the mean of its divisors is an integer number (39210001274304).

Almost surely, 2^{664040344160550} is an apocalyptic number.

664040344160550 is an abundant number, since it is smaller than the sum of its proper divisors (1218039717006042).

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

664040344160550 is a wasteful number, since it uses less digits than its factorization.

664040344160550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632419375413 (or 632419375408 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 48.

The spelling of 664040344160550 in words is "six hundred sixty-four trillion, forty billion, three hundred forty-four million, one hundred sixty thousand, five hundred fifty".