655638605 has 8 divisors (see below), whose sum is σ = 828175200. Its totient is φ = 496904976.

The previous prime is 655638601. The next prime is 655638647. The reversal of 655638605 is 506836556.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 655638605 - 2² = 655638601 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655638601) by changing a digit.

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, 3450635 + ... + 3450824.

It is an arithmetic number, because the mean of its divisors is an integer number (103521900).

Almost surely, 2^655638605 is an apocalyptic number.

It is an amenable number.

655638605 is a deficient number, since it is larger than the sum of its proper divisors (172536595).

655638605 is a wasteful number, since it uses less digits than its factorization.

655638605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6901483.

The product of its (nonzero) digits is 648000, while the sum is 44.

The square root of 655638605 is about 25605.4409257095. The cubic root of 655638605 is about 868.7367074895.

The spelling of 655638605 in words is "six hundred fifty-five million, six hundred thirty-eight thousand, six hundred five".