68898787898989 has 4 divisors (see below), whose sum is σ = 68899100626720. Its totient is φ = 68898475171260.

The previous prime is 68898787898959. The next prime is 68898787899001. The reversal of 68898787898989 is 98989878789886.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68898787898989 - 2³¹ = 68896640415341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68898787898929) 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, 156033159 + ... + 156474100.

It is an arithmetic number, because the mean of its divisors is an integer number (17224775156680).

Almost surely, 2^{68898787898989} is an apocalyptic number.

It is an amenable number.

68898787898989 is a deficient number, since it is larger than the sum of its proper divisors (312727731).

68898787898989 is a wasteful number, since it uses less digits than its factorization.

68898787898989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312727730.

The product of its digits is 4045267795968, while the sum is 112.

The spelling of 68898787898989 in words is "sixty-eight trillion, eight hundred ninety-eight billion, seven hundred eighty-seven million, eight hundred ninety-eight thousand, nine hundred eighty-nine".