64066662561 has 16 divisors (see below), whose sum is σ = 93587832000. Its totient is φ = 38661630720.

The previous prime is 64066662557. The next prime is 64066662581. The reversal of 64066662561 is 16526666046.

It is a happy number.

It is not a de Polignac number, because 64066662561 - 2² = 64066662557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64066662561.

It is not an unprimeable number, because it can be changed into a prime (64066662521) 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 15 ways as a sum of consecutive naturals, for example, 4158436 + ... + 4173813.

It is an arithmetic number, because the mean of its divisors is an integer number (5849239500).

Almost surely, 2^64066662561 is an apocalyptic number.

It is an amenable number.

64066662561 is a deficient number, since it is larger than the sum of its proper divisors (29521169439).

64066662561 is a wasteful number, since it uses less digits than its factorization.

64066662561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8332496.

The product of its (nonzero) digits is 1866240, while the sum is 48.

It can be divided in two parts, 64066 and 662561, that added together give a palindrome (726627).

The spelling of 64066662561 in words is "sixty-four billion, sixty-six million, six hundred sixty-two thousand, five hundred sixty-one".