64323721898 has 8 divisors (see below), whose sum is σ = 96714766020. Its totient is φ = 32085466560.

The previous prime is 64323721849. The next prime is 64323721907. The reversal of 64323721898 is 89812732346.

It can be written as a sum of positive squares in 2 ways, for example, as 42901594129 + 21422127769 = 207127^2 + 146363^2 .

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

It is a super-2 number, since 2×64323721898² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38196143 + ... + 38197826.

Almost surely, 2^64323721898 is an apocalyptic number.

64323721898 is a deficient number, since it is larger than the sum of its proper divisors (32391044122).

64323721898 is a wasteful number, since it uses less digits than its factorization.

64323721898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76394392.

The product of its digits is 3483648, while the sum is 53.

The spelling of 64323721898 in words is "sixty-four billion, three hundred twenty-three million, seven hundred twenty-one thousand, eight hundred ninety-eight".