65621605652 has 12 divisors (see below), whose sum is σ = 118797734580. Its totient is φ = 31679395776.

The previous prime is 65621605639. The next prime is 65621605669. The reversal of 65621605652 is 25650612656.

It can be written as a sum of positive squares in 2 ways, for example, as 38070253456 + 27551352196 = 195116^2 + 165986^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 282851633 + ... + 282851864.

It is an arithmetic number, because the mean of its divisors is an integer number (9899811215).

Almost surely, 2^65621605652 is an apocalyptic number.

It is an amenable number.

65621605652 is a deficient number, since it is larger than the sum of its proper divisors (53176128928).

65621605652 is a wasteful number, since it uses less digits than its factorization.

65621605652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565703530 (or 565703528 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 44.

The spelling of 65621605652 in words is "sixty-five billion, six hundred twenty-one million, six hundred five thousand, six hundred fifty-two".