644322420115 has 16 divisors (see below), whose sum is σ = 857772840960. Its totient is φ = 460655780320.

The previous prime is 644322420101. The next prime is 644322420151. The reversal of 644322420115 is 511024223446.

It is not a de Polignac number, because 644322420115 - 2⁷ = 644322419987 is a prime.

It is a super-2 number, since 2×644322420115² (a number of 24 digits) contains 22 as substring.

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, 99276019 + ... + 99282508.

It is an arithmetic number, because the mean of its divisors is an integer number (53610802560).

Almost surely, 2^644322420115 is an apocalyptic number.

644322420115 is a deficient number, since it is larger than the sum of its proper divisors (213450420845).

644322420115 is a wasteful number, since it uses less digits than its factorization.

644322420115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198558602.

The product of its (nonzero) digits is 46080, while the sum is 34.

The spelling of 644322420115 in words is "six hundred forty-four billion, three hundred twenty-two million, four hundred twenty thousand, one hundred fifteen".