664476225602 has 54 divisors (see below), whose sum is σ = 1177965091737. Its totient is φ = 280296889488.

The previous prime is 664476225557. The next prime is 664476225607. The reversal of 664476225602 is 206522674466.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 407438379481 + 257037846121 = 638309^2 + 506989^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=576401.

It is not an unprimeable number, because it can be changed into a prime (664476225607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 540663524 + ... + 540664752.

Almost surely, 2^664476225602 is an apocalyptic number.

664476225602 is a deficient number, since it is larger than the sum of its proper divisors (513488866135).

664476225602 is an frugal number, since it uses more digits than its factorization.

664476225602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2608 (or 1305 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 50.

Multiplying 664476225602 by its sum of digits (50), we get a square (33223811280100 = 5764010²).

The spelling of 664476225602 in words is "six hundred sixty-four billion, four hundred seventy-six million, two hundred twenty-five thousand, six hundred two".