644566342613462 has 16 divisors (see below), whose sum is σ = 993036929590752. Its totient is φ = 313555021306560.

The previous prime is 644566342613449. The next prime is 644566342613467. The reversal of 644566342613462 is 264316243665446.

It is a junction number, because it is equal to n+sod(n) for n = 644566342613395 and 644566342613404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644566342613467) 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, 245826239 + ... + 248434442.

It is an arithmetic number, because the mean of its divisors is an integer number (62064808099422).

Almost surely, 2^{644566342613462} is an apocalyptic number.

644566342613462 is a deficient number, since it is larger than the sum of its proper divisors (348470586977290).

644566342613462 is a wasteful number, since it uses less digits than its factorization.

644566342613462 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494278343.

The product of its digits is 358318080, while the sum is 62.

The spelling of 644566342613462 in words is "six hundred forty-four trillion, five hundred sixty-six billion, three hundred forty-two million, six hundred thirteen thousand, four hundred sixty-two".