644146544522231 has 8 divisors (see below), whose sum is σ = 644471372870640. Its totient is φ = 643821718451328.

The previous prime is 644146544522189. The next prime is 644146544522269. The reversal of 644146544522231 is 132225445641446.

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 644146544522231 - 2²⁶ = 644146477413367 is a prime.

It is a super-2 number, since 2×644146544522231² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644146544522431) 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, 1090260380 + ... + 1090851038.

It is an arithmetic number, because the mean of its divisors is an integer number (80558921608830).

Almost surely, 2^{644146544522231} is an apocalyptic number.

644146544522231 is a deficient number, since it is larger than the sum of its proper divisors (324828348409).

644146544522231 is a wasteful number, since it uses less digits than its factorization.

644146544522231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1138753.

The product of its digits is 22118400, while the sum is 53.

The spelling of 644146544522231 in words is "six hundred forty-four trillion, one hundred forty-six billion, five hundred forty-four million, five hundred twenty-two thousand, two hundred thirty-one".