644102140063341 has 8 divisors (see below), whose sum is σ = 858809478916864. Its totient is φ = 429398113959360.

The previous prime is 644102140063303. The next prime is 644102140063387. The reversal of 644102140063341 is 143360041201446.

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

It is not a de Polignac number, because 644102140063341 - 2¹⁴ = 644102140046957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 644102140063341.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644102140063541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 827733676 + ... + 828511461.

It is an arithmetic number, because the mean of its divisors is an integer number (107351184864608).

Almost surely, 2^{644102140063341} is an apocalyptic number.

It is an amenable number.

644102140063341 is a deficient number, since it is larger than the sum of its proper divisors (214707338853523).

644102140063341 is a wasteful number, since it uses less digits than its factorization.

644102140063341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656374771.

The product of its (nonzero) digits is 165888, while the sum is 39.

Adding to 644102140063341 its reverse (143360041201446), we get a palindrome (787462181264787).

The spelling of 644102140063341 in words is "six hundred forty-four trillion, one hundred two billion, one hundred forty million, sixty-three thousand, three hundred forty-one".