64642662604666 has 8 divisors (see below), whose sum is σ = 96992404111764. Its totient is φ = 32311861234080.

The previous prime is 64642662604661. The next prime is 64642662604669. The reversal of 64642662604666 is 66640626624646.

It can be written as a sum of positive squares in 2 ways, for example, as 41221215140625 + 23421447464041 = 6420375^2 + 4839571^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 64642662604598 and 64642662604607.

It is not an unprimeable number, because it can be changed into a prime (64642662604661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4735025595 + ... + 4735039246.

Almost surely, 2^{64642662604666} is an apocalyptic number.

64642662604666 is a deficient number, since it is larger than the sum of its proper divisors (32349741507098).

64642662604666 is a wasteful number, since it uses less digits than its factorization.

64642662604666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9470068256.

The product of its (nonzero) digits is 429981696, while the sum is 64.

The spelling of 64642662604666 in words is "sixty-four trillion, six hundred forty-two billion, six hundred sixty-two million, six hundred four thousand, six hundred sixty-six".