68540421069 has 24 divisors (see below), whose sum is σ = 99297753984. Its totient is φ = 45557640000.

The previous prime is 68540420989. The next prime is 68540421071. The reversal of 68540421069 is 96012404586.

68540421069 is a `hidden beast` number, since 6 + 8 + 540 + 42 + 1 + 0 + 69 = 666.

It is not a de Polignac number, because 68540421069 - 2²⁹ = 68003550157 is a prime.

It is a super-2 number, since 2×68540421069² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68540421869) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6981174 + ... + 6990984.

It is an arithmetic number, because the mean of its divisors is an integer number (4137406416).

Almost surely, 2^68540421069 is an apocalyptic number.

It is an amenable number.

68540421069 is a deficient number, since it is larger than the sum of its proper divisors (30757332915).

68540421069 is a wasteful number, since it uses less digits than its factorization.

68540421069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12049 (or 12046 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 68540421069 in words is "sixty-eight billion, five hundred forty million, four hundred twenty-one thousand, sixty-nine".