68515665 has 16 divisors (see below), whose sum is σ = 109753728. Its totient is φ = 36498816.

The previous prime is 68515621. The next prime is 68515679. The reversal of 68515665 is 56651586.

It is not a de Polignac number, because 68515665 - 2⁸ = 68515409 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 13797 + ... + 18093.

It is an arithmetic number, because the mean of its divisors is an integer number (6859608).

Almost surely, 2^68515665 is an apocalyptic number.

It is an amenable number.

68515665 is a deficient number, since it is larger than the sum of its proper divisors (41238063).

68515665 is a wasteful number, since it uses less digits than its factorization.

68515665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5368.

The product of its digits is 216000, while the sum is 42.

The square root of 68515665 is about 8277.4189817841. The cubic root of 68515665 is about 409.1946614734.

The spelling of 68515665 in words is "sixty-eight million, five hundred fifteen thousand, six hundred sixty-five".