655689649 has 8 divisors (see below), whose sum is σ = 679347200. Its totient is φ = 632188800.

The previous prime is 655689647. The next prime is 655689653. The reversal of 655689649 is 946986556.

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

It is not a de Polignac number, because 655689649 - 2¹ = 655689647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 655689593 and 655689602.

It is not an unprimeable number, because it can be changed into a prime (655689647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30624 + ... + 47425.

It is an arithmetic number, because the mean of its divisors is an integer number (84918400).

Almost surely, 2^655689649 is an apocalyptic number.

It is an amenable number.

655689649 is a deficient number, since it is larger than the sum of its proper divisors (23657551).

655689649 is a wasteful number, since it uses less digits than its factorization.

655689649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78351.

The product of its digits is 13996800, while the sum is 58.

The square root of 655689649 is about 25606.4376475917. The cubic root of 655689649 is about 868.7592517414.

The spelling of 655689649 in words is "six hundred fifty-five million, six hundred eighty-nine thousand, six hundred forty-nine".