644554082073 has 16 divisors (see below), whose sum is σ = 937555505856. Its totient is φ = 390629547840.

The previous prime is 644554082069. The next prime is 644554082077. The reversal of 644554082073 is 370280455446.

It is an interprime number because it is at equal distance from previous prime (644554082069) and next prime (644554082077).

It is not a de Polignac number, because 644554082073 - 2² = 644554082069 is a prime.

It is a super-3 number, since 3×644554082073³ (a number of 36 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (644554082077) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1334115 + ... + 1751847.

It is an arithmetic number, because the mean of its divisors is an integer number (58597219116).

Almost surely, 2^644554082073 is an apocalyptic number.

It is an amenable number.

644554082073 is a deficient number, since it is larger than the sum of its proper divisors (293001423783).

644554082073 is a wasteful number, since it uses less digits than its factorization.

644554082073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464504.

The product of its (nonzero) digits is 3225600, while the sum is 48.

The spelling of 644554082073 in words is "six hundred forty-four billion, five hundred fifty-four million, eighty-two thousand, seventy-three".