68216154815 has 16 divisors (see below), whose sum is σ = 83807383968. Its totient is φ = 53275600896.

The previous prime is 68216154793. The next prime is 68216154817. The reversal of 68216154815 is 51845161286.

It is a cyclic number.

It is not a de Polignac number, because 68216154815 - 2¹² = 68216150719 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68216154815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68216154817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 328367 + ... + 494223.

It is an arithmetic number, because the mean of its divisors is an integer number (5237961498).

Almost surely, 2^68216154815 is an apocalyptic number.

68216154815 is a deficient number, since it is larger than the sum of its proper divisors (15591229153).

68216154815 is a wasteful number, since it uses less digits than its factorization.

68216154815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167818.

The product of its digits is 460800, while the sum is 47.

The spelling of 68216154815 in words is "sixty-eight billion, two hundred sixteen million, one hundred fifty-four thousand, eight hundred fifteen".