655444612639 has 2 divisors, whose sum is σ = 655444612640. Its totient is φ = 655444612638.

The previous prime is 655444612609. The next prime is 655444612709. The reversal of 655444612639 is 936216444556.

It is a happy number.

655444612639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 655444612639 - 2¹⁷ = 655444481567 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 655444612639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (655444612609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327722306319 + 327722306320.

It is an arithmetic number, because the mean of its divisors is an integer number (327722306320).

Almost surely, 2^655444612639 is an apocalyptic number.

655444612639 is a deficient number, since it is larger than the sum of its proper divisors (1).

655444612639 is an equidigital number, since it uses as much as digits as its factorization.

655444612639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18662400, while the sum is 55.

The spelling of 655444612639 in words is "six hundred fifty-five billion, four hundred forty-four million, six hundred twelve thousand, six hundred thirty-nine".