68880516136 has 8 divisors (see below), whose sum is σ = 129150967770. Its totient is φ = 34440258064.

The previous prime is 68880516101. The next prime is 68880516143. The reversal of 68880516136 is 63161508886.

It can be written as a sum of positive squares in only one way, i.e., 68523532900 + 356983236 = 261770^2 + 18894^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4305032251 + ... + 4305032266.

Almost surely, 2^68880516136 is an apocalyptic number.

It is an amenable number.

68880516136 is a deficient number, since it is larger than the sum of its proper divisors (60270451634).

68880516136 is a wasteful number, since it uses less digits than its factorization.

68880516136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8610064523 (or 8610064519 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 52.

The spelling of 68880516136 in words is "sixty-eight billion, eight hundred eighty million, five hundred sixteen thousand, one hundred thirty-six".