64440659685 has 8 divisors (see below), whose sum is σ = 103105055520. Its totient is φ = 34368351824.

The previous prime is 64440659683. The next prime is 64440659771. The reversal of 64440659685 is 58695604446.

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

It is a cyclic number.

It is not a de Polignac number, because 64440659685 - 2¹ = 64440659683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64440659681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2148021975 + ... + 2148022004.

It is an arithmetic number, because the mean of its divisors is an integer number (12888131940).

Almost surely, 2^64440659685 is an apocalyptic number.

It is an amenable number.

64440659685 is a deficient number, since it is larger than the sum of its proper divisors (38664395835).

64440659685 is a wasteful number, since it uses less digits than its factorization.

64440659685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4296043987.

The product of its (nonzero) digits is 24883200, while the sum is 57.

The spelling of 64440659685 in words is "sixty-four billion, four hundred forty million, six hundred fifty-nine thousand, six hundred eighty-five".