68656509 has 24 divisors (see below), whose sum is σ = 103975872. Its totient is φ = 43606080.

The previous prime is 68656501. The next prime is 68656513. The reversal of 68656509 is 90565686.

68656509 is a `hidden beast` number, since 6 + 86 + 565 + 0 + 9 = 666.

It is not a de Polignac number, because 68656509 - 2³ = 68656501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68656501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13704 + ... + 18030.

It is an arithmetic number, because the mean of its divisors is an integer number (4332328).

Almost surely, 2^68656509 is an apocalyptic number.

It is an amenable number.

68656509 is a deficient number, since it is larger than the sum of its proper divisors (35319363).

68656509 is a wasteful number, since it uses less digits than its factorization.

68656509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4417 (or 4414 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The square root of 68656509 is about 8285.9223385209. The cubic root of 68656509 is about 409.4748561178.

The spelling of 68656509 in words is "sixty-eight million, six hundred fifty-six thousand, five hundred nine".