68017421909493 has 24 divisors (see below), whose sum is σ = 112313315028096. Its totient is φ = 38856510496800.

The previous prime is 68017421909473. The next prime is 68017421909531. The reversal of 68017421909493 is 39490912471086.

68017421909493 is a `hidden beast` number, since 6 + 8 + 0 + 17 + 42 + 1 + 90 + 9 + 493 = 666.

It is not a de Polignac number, because 68017421909493 - 2¹² = 68017421905397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 68017421909493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68017421909443) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 146818798 + ... + 147281343.

It is an arithmetic number, because the mean of its divisors is an integer number (4679721459504).

Almost surely, 2^{68017421909493} is an apocalyptic number.

68017421909493 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

It is an amenable number.

68017421909493 is a deficient number, since it is larger than the sum of its proper divisors (44295893118603).

68017421909493 is a wasteful number, since it uses less digits than its factorization.

68017421909493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294103825 (or 294103822 counting only the distinct ones).

The product of its (nonzero) digits is 23514624, while the sum is 63.

The spelling of 68017421909493 in words is "sixty-eight trillion, seventeen billion, four hundred twenty-one million, nine hundred nine thousand, four hundred ninety-three".