68642123688 has 48 divisors (see below), whose sum is σ = 195690268800. Its totient is φ = 21676459680.

The previous prime is 68642123681. The next prime is 68642123723. The reversal of 68642123688 is 88632124686.

68642123688 is a `hidden beast` number, since 6 + 8 + 64 + 212 + 368 + 8 = 666.

It is a super-2 number, since 2×68642123688² (a number of 22 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (68642123681) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25087128 + ... + 25089863.

It is an arithmetic number, because the mean of its divisors is an integer number (4076880600).

Almost surely, 2^68642123688 is an apocalyptic number.

It is an amenable number.

68642123688 is an abundant number, since it is smaller than the sum of its proper divisors (127048145112).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68642123688 is a wasteful number, since it uses less digits than its factorization.

68642123688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50177022 (or 50177015 counting only the distinct ones).

The product of its digits is 5308416, while the sum is 54.

The spelling of 68642123688 in words is "sixty-eight billion, six hundred forty-two million, one hundred twenty-three thousand, six hundred eighty-eight".