64698889646 has 32 divisors (see below), whose sum is σ = 107288877888. Its totient is φ = 29105359360.

The previous prime is 64698889621. The next prime is 64698889691.

64698889646 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1331336 + ... + 1379076.

It is an arithmetic number, because the mean of its divisors is an integer number (3352777434).

Almost surely, 2^64698889646 is an apocalyptic number.

64698889646 is a deficient number, since it is larger than the sum of its proper divisors (42589988242).

64698889646 is a wasteful number, since it uses less digits than its factorization.

64698889646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49516.

The product of its digits is 859963392, while the sum is 74.

The spelling of 64698889646 in words is "sixty-four billion, six hundred ninety-eight million, eight hundred eighty-nine thousand, six hundred forty-six".