68431675664261 has 32 divisors (see below), whose sum is σ = 89179429425408. Its totient is φ = 50957960647680.

The previous prime is 68431675664249. The next prime is 68431675664263. The reversal of 68431675664261 is 16246657613486.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 68431675664261 - 2²⁶ = 68431608555397 is a prime.

It is a super-2 number, since 2×68431675664261² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68431675664263) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100529831 + ... + 101208251.

It is an arithmetic number, because the mean of its divisors is an integer number (2786857169544).

Almost surely, 2^{68431675664261} is an apocalyptic number.

It is an amenable number.

68431675664261 is a deficient number, since it is larger than the sum of its proper divisors (20747753761147).

68431675664261 is a wasteful number, since it uses less digits than its factorization.

68431675664261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743661.

The product of its digits is 209018880, while the sum is 65.

The spelling of 68431675664261 in words is "sixty-eight trillion, four hundred thirty-one billion, six hundred seventy-five million, six hundred sixty-four thousand, two hundred sixty-one".