68481551 has 2 divisors, whose sum is σ = 68481552. Its totient is φ = 68481550.

The previous prime is 68481541. The next prime is 68481563. The reversal of 68481551 is 15518486.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68481551 - 2¹⁰ = 68480527 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68481541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34240775 + 34240776.

It is an arithmetic number, because the mean of its divisors is an integer number (34240776).

Almost surely, 2^68481551 is an apocalyptic number.

68481551 is a deficient number, since it is larger than the sum of its proper divisors (1).

68481551 is an equidigital number, since it uses as much as digits as its factorization.

68481551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38400, while the sum is 38.

The square root of 68481551 is about 8275.3580587187. The cubic root of 68481551 is about 409.1267374247.

The spelling of 68481551 in words is "sixty-eight million, four hundred eighty-one thousand, five hundred fifty-one".