68425563978981 has 48 divisors (see below), whose sum is σ = 108224401259520. Its totient is φ = 41315320404000.

The previous prime is 68425563978953. The next prime is 68425563979049. The reversal of 68425563978981 is 18987936552486.

68425563978981 is a `hidden beast` number, since 6 + 8 + 4 + 25 + 56 + 397 + 89 + 81 = 666.

It is not a de Polignac number, because 68425563978981 - 2¹⁰ = 68425563977957 is a prime.

It is a super-2 number, since 2×68425563978981² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 68425563978981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68425563978781) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1043373850 + ... + 1043439428.

It is an arithmetic number, because the mean of its divisors is an integer number (2254675026240).

Almost surely, 2^{68425563978981} is an apocalyptic number.

It is an amenable number.

68425563978981 is a deficient number, since it is larger than the sum of its proper divisors (39798837280539).

68425563978981 is a wasteful number, since it uses less digits than its factorization.

68425563978981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104758 (or 104755 counting only the distinct ones).

The product of its digits is 6270566400, while the sum is 81.

The spelling of 68425563978981 in words is "sixty-eight trillion, four hundred twenty-five billion, five hundred sixty-three million, nine hundred seventy-eight thousand, nine hundred eighty-one".