68515655 has 16 divisors (see below), whose sum is σ = 88949280. Its totient is φ = 50364288.

The previous prime is 68515621. The next prime is 68515679. The reversal of 68515655 is 55651586.

It is not a de Polignac number, because 68515655 - 2¹⁶ = 68450119 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12584 + ... + 17186.

It is an arithmetic number, because the mean of its divisors is an integer number (5559330).

Almost surely, 2^68515655 is an apocalyptic number.

68515655 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

68515655 is a deficient number, since it is larger than the sum of its proper divisors (20433625).

68515655 is a wasteful number, since it uses less digits than its factorization.

68515655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4850.

The product of its digits is 180000, while the sum is 41.

The square root of 68515655 is about 8277.4183777311. The cubic root of 68515655 is about 409.1946415658.

The spelling of 68515655 in words is "sixty-eight million, five hundred fifteen thousand, six hundred fifty-five".