68999951 has 2 divisors, whose sum is σ = 68999952. Its totient is φ = 68999950.

The previous prime is 68999939. The next prime is 68999971. The reversal of 68999951 is 15999986.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68999951 - 2¹⁰ = 68998927 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 (68999971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34499975 + 34499976.

It is an arithmetic number, because the mean of its divisors is an integer number (34499976).

Almost surely, 2^68999951 is an apocalyptic number.

68999951 is a deficient number, since it is larger than the sum of its proper divisors (1).

68999951 is an equidigital number, since it uses as much as digits as its factorization.

68999951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1574640, while the sum is 56.

The square root of 68999951 is about 8306.6209134642. The cubic root of 68999951 is about 410.1564958800.

The spelling of 68999951 in words is "sixty-eight million, nine hundred ninety-nine thousand, nine hundred fifty-one".