68400443905 has 16 divisors (see below), whose sum is σ = 82555200000. Its totient is φ = 54404066880.

The previous prime is 68400443879. The next prime is 68400443911. The reversal of 68400443905 is 50934400486.

It is a happy number.

It is not a de Polignac number, because 68400443905 - 2²⁹ = 67863572993 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4879096 + ... + 4893094.

It is an arithmetic number, because the mean of its divisors is an integer number (5159700000).

Almost surely, 2^68400443905 is an apocalyptic number.

It is an amenable number.

68400443905 is a deficient number, since it is larger than the sum of its proper divisors (14154756095).

68400443905 is a wasteful number, since it uses less digits than its factorization.

68400443905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19584.

The product of its (nonzero) digits is 414720, while the sum is 43.

The spelling of 68400443905 in words is "sixty-eight billion, four hundred million, four hundred forty-three thousand, nine hundred five".