64687909105 has 32 divisors (see below), whose sum is σ = 82575360000. Its totient is φ = 48510124992.

The previous prime is 64687909087. The next prime is 64687909189. The reversal of 64687909105 is 50190978646.

It is a cyclic number.

It is not a de Polignac number, because 64687909105 - 2⁵ = 64687909073 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4613896 + ... + 4627894.

It is an arithmetic number, because the mean of its divisors is an integer number (2580480000).

Almost surely, 2^64687909105 is an apocalyptic number.

It is an amenable number.

64687909105 is a deficient number, since it is larger than the sum of its proper divisors (17887450895).

64687909105 is a wasteful number, since it uses less digits than its factorization.

64687909105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14533.

The product of its (nonzero) digits is 3265920, while the sum is 55.

The spelling of 64687909105 in words is "sixty-four billion, six hundred eighty-seven million, nine hundred nine thousand, one hundred five".