644835954422 has 16 divisors (see below), whose sum is σ = 1055203282944. Its totient is φ = 293102481000.

The previous prime is 644835954409. The next prime is 644835954431. The reversal of 644835954422 is 224459538446.

It is a super-2 number, since 2×644835954422² (a number of 24 digits) contains 22 as substring.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 1391147 + ... + 1795817.

It is an arithmetic number, because the mean of its divisors is an integer number (65950205184).

Almost surely, 2^644835954422 is an apocalyptic number.

644835954422 is a deficient number, since it is larger than the sum of its proper divisors (410367328522).

644835954422 is a wasteful number, since it uses less digits than its factorization.

644835954422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477115.

The product of its digits is 33177600, while the sum is 56.

The spelling of 644835954422 in words is "six hundred forty-four billion, eight hundred thirty-five million, nine hundred fifty-four thousand, four hundred twenty-two".