644356358086 has 16 divisors (see below), whose sum is σ = 1104621258240. Its totient is φ = 276150135240.

The previous prime is 644356358083. The next prime is 644356358119. The reversal of 644356358086 is 680853653446.

644356358086 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 644356358086.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (644356358083) 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, 2574445 + ... + 2813623.

It is an arithmetic number, because the mean of its divisors is an integer number (69038828640).

Almost surely, 2^644356358086 is an apocalyptic number.

644356358086 is a deficient number, since it is larger than the sum of its proper divisors (460264900154).

644356358086 is a wasteful number, since it uses less digits than its factorization.

644356358086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431619.

The product of its (nonzero) digits is 49766400, while the sum is 58.

The spelling of 644356358086 in words is "six hundred forty-four billion, three hundred fifty-six million, three hundred fifty-eight thousand, eighty-six".