654991091664 has 240 divisors, whose sum is σ = 2120679892800. Its totient is φ = 172667013120.

The previous prime is 654991091647. The next prime is 654991091737. The reversal of 654991091664 is 466190199456.

It is a junction number, because it is equal to n+sod(n) for n = 654991091598 and 654991091607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 105453519 + ... + 105459729.

It is an arithmetic number, because the mean of its divisors is an integer number (8836166220).

Almost surely, 2^654991091664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 654991091664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1060339946400).

654991091664 is an abundant number, since it is smaller than the sum of its proper divisors (1465688801136).

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

654991091664 is a wasteful number, since it uses less digits than its factorization.

654991091664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9698 (or 9685 counting only the distinct ones).

The product of its (nonzero) digits is 12597120, while the sum is 60.

The spelling of 654991091664 in words is "six hundred fifty-four billion, nine hundred ninety-one million, ninety-one thousand, six hundred sixty-four".