64660671818 has 8 divisors (see below), whose sum is σ = 98438634912. Its totient is φ = 31847793516.

The previous prime is 64660671809. The next prime is 64660671871. The reversal of 64660671818 is 81817606646.

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

It is a self number, because there is not a number n which added to its sum of digits gives 64660671818.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241271030 + ... + 241271297.

It is an arithmetic number, because the mean of its divisors is an integer number (12304829364).

Almost surely, 2^64660671818 is an apocalyptic number.

64660671818 is a deficient number, since it is larger than the sum of its proper divisors (33777963094).

64660671818 is a wasteful number, since it uses less digits than its factorization.

64660671818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482542396.

The product of its (nonzero) digits is 2322432, while the sum is 53.

The spelling of 64660671818 in words is "sixty-four billion, six hundred sixty million, six hundred seventy-one thousand, eight hundred eighteen".