644114136654 has 192 divisors, whose sum is σ = 1556599524480. Its totient is φ = 191630499840.

The previous prime is 644114136643. The next prime is 644114136713. The reversal of 644114136654 is 456631411446.

644114136654 is a `hidden beast` number, since 6 + 441 + 14 + 136 + 65 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 72473799 + ... + 72482685.

It is an arithmetic number, because the mean of its divisors is an integer number (8107289190).

Almost surely, 2^644114136654 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 644114136654, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (778299762240).

644114136654 is an abundant number, since it is smaller than the sum of its proper divisors (912485387826).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

644114136654 is a wasteful number, since it uses less digits than its factorization.

644114136654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9115 (or 9112 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The spelling of 644114136654 in words is "six hundred forty-four billion, one hundred fourteen million, one hundred thirty-six thousand, six hundred fifty-four".