68456621 has 2 divisors, whose sum is σ = 68456622. Its totient is φ = 68456620.

The previous prime is 68456537. The next prime is 68456627. The reversal of 68456621 is 12665486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63027721 + 5428900 = 7939^2 + 2330^2 .

It is a cyclic number.

It is not a de Polignac number, because 68456621 - 2²⁶ = 1347757 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68456627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34228310 + 34228311.

It is an arithmetic number, because the mean of its divisors is an integer number (34228311).

Almost surely, 2^68456621 is an apocalyptic number.

It is an amenable number.

68456621 is a deficient number, since it is larger than the sum of its proper divisors (1).

68456621 is an equidigital number, since it uses as much as digits as its factorization.

68456621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 38.

The square root of 68456621 is about 8273.8516423731. The cubic root of 68456621 is about 409.0770852807.

The spelling of 68456621 in words is "sixty-eight million, four hundred fifty-six thousand, six hundred twenty-one".