68440310643 has 8 divisors (see below), whose sum is σ = 91254966208. Its totient is φ = 45626264424.

The previous prime is 68440310623. The next prime is 68440310657. The reversal of 68440310643 is 34601304486.

It is a happy number.

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

It is not a de Polignac number, because 68440310643 - 2⁹ = 68440310131 is a prime.

It is a super-2 number, since 2×68440310643² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68440310623) 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, 311496 + ... + 483642.

It is an arithmetic number, because the mean of its divisors is an integer number (11406870776).

Almost surely, 2^68440310643 is an apocalyptic number.

68440310643 is a deficient number, since it is larger than the sum of its proper divisors (22814655565).

68440310643 is a wasteful number, since it uses less digits than its factorization.

68440310643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304673.

The product of its (nonzero) digits is 165888, while the sum is 39.

The spelling of 68440310643 in words is "sixty-eight billion, four hundred forty million, three hundred ten thousand, six hundred forty-three".