68311554768 has 50 divisors (see below), whose sum is σ = 197713462034. Its totient is φ = 22770517824.

The previous prime is 68311554761. The next prime is 68311554781. The reversal of 68311554768 is 86745511386.

It is a happy number.

68311554768 is a `hidden beast` number, since 6 + 8 + 3 + 11 + 554 + 76 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 35625807504 + 32685747264 = 188748^2 + 180792^2 .

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68311554761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 26353471 + ... + 26356062.

Almost surely, 2^68311554768 is an apocalyptic number.

It is an amenable number.

68311554768 is an abundant number, since it is smaller than the sum of its proper divisors (129401907266).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68311554768 is a wasteful number, since it uses less digits than its factorization.

68311554768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52709553 (or 52709538 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 54.

The spelling of 68311554768 in words is "sixty-eight billion, three hundred eleven million, five hundred fifty-four thousand, seven hundred sixty-eight".