655225664 has 14 divisors (see below), whose sum is σ = 1300213554. Its totient is φ = 327612800.

The previous prime is 655225663. The next prime is 655225673. The reversal of 655225664 is 466522556.

It can be written as a sum of positive squares in only one way, i.e., 574081600 + 81144064 = 23960^2 + 9008^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655225661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5118887 + ... + 5119014.

Almost surely, 2^655225664 is an apocalyptic number.

655225664 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

655225664 is a deficient number, since it is larger than the sum of its proper divisors (644987890).

655225664 is a wasteful number, since it uses less digits than its factorization.

655225664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10237913 (or 10237903 counting only the distinct ones).

The product of its digits is 432000, while the sum is 41.

The square root of 655225664 is about 25597.3761155318. The cubic root of 655225664 is about 868.5542836446.

The spelling of 655225664 in words is "six hundred fifty-five million, two hundred twenty-five thousand, six hundred sixty-four".