644012226206535 has 8 divisors (see below), whose sum is σ = 1030419561930480. Its totient is φ = 343473187310144.

The previous prime is 644012226206527. The next prime is 644012226206689. The reversal of 644012226206535 is 535602622210446.

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

It is a cyclic number.

It is not a de Polignac number, because 644012226206535 - 2³ = 644012226206527 is a prime.

It is a super-3 number, since 3×644012226206535³ (a number of 45 digits) contains 333 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 (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21467074206870 + ... + 21467074206899.

It is an arithmetic number, because the mean of its divisors is an integer number (128802445241310).

Almost surely, 2^{644012226206535} is an apocalyptic number.

644012226206535 is a deficient number, since it is larger than the sum of its proper divisors (386407335723945).

644012226206535 is a wasteful number, since it uses less digits than its factorization.

644012226206535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42934148413777.

The product of its (nonzero) digits is 4147200, while the sum is 48.

The spelling of 644012226206535 in words is "six hundred forty-four trillion, twelve billion, two hundred twenty-six million, two hundred six thousand, five hundred thirty-five".