68517455381 has 8 divisors (see below), whose sum is σ = 70238530080. Its totient is φ = 66812243472.

The previous prime is 68517455371. The next prime is 68517455387. The reversal of 68517455381 is 18355471586.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68517455381 - 2¹⁸ = 68517193237 is a prime.

It is a super-2 number, since 2×68517455381² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68517455387) 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 7 ways as a sum of consecutive naturals, for example, 3956951 + ... + 3974228.

It is an arithmetic number, because the mean of its divisors is an integer number (8779816260).

Almost surely, 2^68517455381 is an apocalyptic number.

It is an amenable number.

68517455381 is a deficient number, since it is larger than the sum of its proper divisors (1721074699).

68517455381 is a wasteful number, since it uses less digits than its factorization.

68517455381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7931395.

The product of its digits is 4032000, while the sum is 53.

The spelling of 68517455381 in words is "sixty-eight billion, five hundred seventeen million, four hundred fifty-five thousand, three hundred eighty-one".