68787818755 has 4 divisors (see below), whose sum is σ = 82545382512. Its totient is φ = 55030255000.

The previous prime is 68787818753. The next prime is 68787818773. The reversal of 68787818755 is 55781878786.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55781878786 = 2 ⋅27890939393.

It is not a de Polignac number, because 68787818755 - 2¹ = 68787818753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68787818753) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6878781871 + ... + 6878781880.

It is an arithmetic number, because the mean of its divisors is an integer number (20636345628).

Almost surely, 2^68787818755 is an apocalyptic number.

68787818755 is a deficient number, since it is larger than the sum of its proper divisors (13757563757).

68787818755 is a wasteful number, since it uses less digits than its factorization.

68787818755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13757563756.

The product of its digits is 210739200, while the sum is 70.

The spelling of 68787818755 in words is "sixty-eight billion, seven hundred eighty-seven million, eight hundred eighteen thousand, seven hundred fifty-five".