644710170438469 has 2 divisors, whose sum is σ = 644710170438470. Its totient is φ = 644710170438468.

The previous prime is 644710170438461. The next prime is 644710170438487. The reversal of 644710170438469 is 964834071017446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 643836577384225 + 873593054244 = 25373935^2 + 934662^2 .

It is a cyclic number.

It is not a de Polignac number, because 644710170438469 - 2³ = 644710170438461 is a prime.

It is a super-2 number, since 2×644710170438469² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 644710170438469.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (644710170438461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322355085219234 + 322355085219235.

It is an arithmetic number, because the mean of its divisors is an integer number (322355085219235).

Almost surely, 2^{644710170438469} is an apocalyptic number.

It is an amenable number.

644710170438469 is a deficient number, since it is larger than the sum of its proper divisors (1).

644710170438469 is an equidigital number, since it uses as much as digits as its factorization.

644710170438469 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97542144, while the sum is 64.

The spelling of 644710170438469 in words is "six hundred forty-four trillion, seven hundred ten billion, one hundred seventy million, four hundred thirty-eight thousand, four hundred sixty-nine".