68646665 has 8 divisors (see below), whose sum is σ = 82555200. Its totient is φ = 54797872.

The previous prime is 68646661. The next prime is 68646671. The reversal of 68646665 is 56664686.

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 68646665 - 2² = 68646661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68646661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12365 + ... + 17034.

It is an arithmetic number, because the mean of its divisors is an integer number (10319400).

Almost surely, 2^68646665 is an apocalyptic number.

It is an amenable number.

68646665 is a deficient number, since it is larger than the sum of its proper divisors (13908535).

68646665 is a wasteful number, since it uses less digits than its factorization.

68646665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29871.

The product of its digits is 1244160, while the sum is 47.

The square root of 68646665 is about 8285.3282976597. The cubic root of 68646665 is about 409.4552849550.

The spelling of 68646665 in words is "sixty-eight million, six hundred forty-six thousand, six hundred sixty-five".