68154449681 has 8 divisors (see below), whose sum is σ = 71786201280. Its totient is φ = 64527165648.

The previous prime is 68154449669. The next prime is 68154449723. The reversal of 68154449681 is 18694445186.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68154449681 is a prime.

It is a super-2 number, since 2×68154449681² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68154449081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1085546 + ... + 1146611.

It is an arithmetic number, because the mean of its divisors is an integer number (8973275160).

Almost surely, 2^68154449681 is an apocalyptic number.

It is an amenable number.

68154449681 is a deficient number, since it is larger than the sum of its proper divisors (3631751599).

68154449681 is a wasteful number, since it uses less digits than its factorization.

68154449681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2233783.

The product of its digits is 6635520, while the sum is 56.

The spelling of 68154449681 in words is "sixty-eight billion, one hundred fifty-four million, four hundred forty-nine thousand, six hundred eighty-one".