68995551623 has 2 divisors, whose sum is σ = 68995551624. Its totient is φ = 68995551622.

The previous prime is 68995551617. The next prime is 68995551661. The reversal of 68995551623 is 32615559986.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68995551623 - 2⁴ = 68995551607 is a prime.

It is a super-2 number, since 2×68995551623² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68995554623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34497775811 + 34497775812.

It is an arithmetic number, because the mean of its divisors is an integer number (34497775812).

Almost surely, 2^68995551623 is an apocalyptic number.

68995551623 is a deficient number, since it is larger than the sum of its proper divisors (1).

68995551623 is an equidigital number, since it uses as much as digits as its factorization.

68995551623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496000, while the sum is 59.

The spelling of 68995551623 in words is "sixty-eight billion, nine hundred ninety-five million, five hundred fifty-one thousand, six hundred twenty-three".