64666665650664 has 192 divisors, whose sum is σ = 229847342400000. Its totient is φ = 15912508268160.

The previous prime is 64666665650627. The next prime is 64666665650677. The reversal of 64666665650664 is 46605656666646.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 64666665650592 and 64666665650601.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 306848914 + ... + 307059585.

It is an arithmetic number, because the mean of its divisors is an integer number (1197121575000).

Almost surely, 2^{64666665650664} is an apocalyptic number.

It is an amenable number.

64666665650664 is an abundant number, since it is smaller than the sum of its proper divisors (165180676749336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64666665650664 is a wasteful number, since it uses less digits than its factorization.

64666665650664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613908548 (or 613908541 counting only the distinct ones).

The product of its (nonzero) digits is 4031078400, while the sum is 72.

The spelling of 64666665650664 in words is "sixty-four trillion, six hundred sixty-six billion, six hundred sixty-five million, six hundred fifty thousand, six hundred sixty-four".