644362131872734 has 16 divisors (see below), whose sum is σ = 1054421186747760. Its totient is φ = 292888982151360.

The previous prime is 644362131872639. The next prime is 644362131872743. The reversal of 644362131872734 is 437278131263446.

It is a happy number.

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, 142522239 + ... + 146973850.

It is an arithmetic number, because the mean of its divisors is an integer number (65901324171735).

Almost surely, 2^{644362131872734} is an apocalyptic number.

644362131872734 is a deficient number, since it is larger than the sum of its proper divisors (410059054875026).

644362131872734 is a wasteful number, since it uses less digits than its factorization.

644362131872734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289597275.

The product of its digits is 97542144, while the sum is 61.

The spelling of 644362131872734 in words is "six hundred forty-four trillion, three hundred sixty-two billion, one hundred thirty-one million, eight hundred seventy-two thousand, seven hundred thirty-four".