68621953 has 2 divisors, whose sum is σ = 68621954. Its totient is φ = 68621952.

The previous prime is 68621951. The next prime is 68621963. The reversal of 68621953 is 35912686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49112064 + 19509889 = 7008^2 + 4417^2 .

It is a cyclic number.

It is not a de Polignac number, because 68621953 - 2¹ = 68621951 is a prime.

Together with 68621951, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (68621951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34310976 + 34310977.

It is an arithmetic number, because the mean of its divisors is an integer number (34310977).

Almost surely, 2^68621953 is an apocalyptic number.

It is an amenable number.

68621953 is a deficient number, since it is larger than the sum of its proper divisors (1).

68621953 is an equidigital number, since it uses as much as digits as its factorization.

68621953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 40.

The square root of 68621953 is about 8283.8368525702. The cubic root of 68621953 is about 409.4061460133.

The spelling of 68621953 in words is "sixty-eight million, six hundred twenty-one thousand, nine hundred fifty-three".