68654905987 has 4 divisors (see below), whose sum is σ = 68683864456. Its totient is φ = 68625947520.

The previous prime is 68654905981. The next prime is 68654906027. The reversal of 68654905987 is 78950945686.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68654905987 - 2¹⁵ = 68654873219 is a prime.

It is a super-2 number, since 2×68654905987² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68654905981) 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, 14475678 + ... + 14480419.

It is an arithmetic number, because the mean of its divisors is an integer number (17170966114).

Almost surely, 2^68654905987 is an apocalyptic number.

68654905987 is a deficient number, since it is larger than the sum of its proper divisors (28958469).

68654905987 is a wasteful number, since it uses less digits than its factorization.

68654905987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28958468.

The product of its (nonzero) digits is 130636800, while the sum is 67.

The spelling of 68654905987 in words is "sixty-eight billion, six hundred fifty-four million, nine hundred five thousand, nine hundred eighty-seven".