644362630612622 has 16 divisors (see below), whose sum is σ = 987915519051120. Its totient is φ = 315112896177408.

The previous prime is 644362630612541. The next prime is 644362630612627. The reversal of 644362630612622 is 226216036263446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644362630612627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13859622083 + ... + 13859668574.

It is an arithmetic number, because the mean of its divisors is an integer number (61744719940695).

Almost surely, 2^{644362630612622} is an apocalyptic number.

644362630612622 is a deficient number, since it is larger than the sum of its proper divisors (343552888438498).

644362630612622 is a wasteful number, since it uses less digits than its factorization.

644362630612622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27719290915.

The product of its (nonzero) digits is 17915904, while the sum is 53.

The spelling of 644362630612622 in words is "six hundred forty-four trillion, three hundred sixty-two billion, six hundred thirty million, six hundred twelve thousand, six hundred twenty-two".