64425661666664 has 16 divisors (see below), whose sum is σ = 120799016189700. Its totient is φ = 32212590682752.

The previous prime is 64425661666661. The next prime is 64425661666679. The reversal of 64425661666664 is 46666616652446.

It can be written as a sum of positive squares in 2 ways, for example, as 63174042204100 + 1251619462564 = 7948210^2 + 1118758^2 .

It is a junction number, because it is equal to n+sod(n) for n = 64425661666594 and 64425661666603.

It is not an unprimeable number, because it can be changed into a prime (64425661666661) 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, 28876109 + ... + 31027100.

Almost surely, 2^{64425661666664} is an apocalyptic number.

It is an amenable number.

64425661666664 is a deficient number, since it is larger than the sum of its proper divisors (56373354523036).

64425661666664 is a wasteful number, since it uses less digits than its factorization.

64425661666664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60037652 (or 60037648 counting only the distinct ones).

The product of its digits is 1074954240, while the sum is 68.

The spelling of 64425661666664 in words is "sixty-four trillion, four hundred twenty-five billion, six hundred sixty-one million, six hundred sixty-six thousand, six hundred sixty-four".