654521664 has 56 divisors (see below), whose sum is σ = 1751258880. Its totient is φ = 215716864.

The previous prime is 654521627. The next prime is 654521683. The reversal of 654521664 is 466125456.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2064 + ... + 36239.

It is an arithmetic number, because the mean of its divisors is an integer number (31272480).

Almost surely, 2^654521664 is an apocalyptic number.

654521664 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 654521664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (875629440).

654521664 is an abundant number, since it is smaller than the sum of its proper divisors (1096737216).

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

654521664 is a wasteful number, since it uses less digits than its factorization.

654521664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38407 (or 38397 counting only the distinct ones).

The product of its digits is 172800, while the sum is 39.

The square root of 654521664 is about 25583.6210103261. The cubic root of 654521664 is about 868.2431026408.

The spelling of 654521664 in words is "six hundred fifty-four million, five hundred twenty-one thousand, six hundred sixty-four".