68778959 has 2 divisors, whose sum is σ = 68778960. Its totient is φ = 68778958.

The previous prime is 68778943. The next prime is 68778961. The reversal of 68778959 is 95987786.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68778959 - 2⁴ = 68778943 is a prime.

It is a super-2 number, since 2×68778959² = 9461090402247362, which contains 22 as substring.

Together with 68778961, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 68778898 and 68778907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68778929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34389479 + 34389480.

It is an arithmetic number, because the mean of its divisors is an integer number (34389480).

Almost surely, 2^68778959 is an apocalyptic number.

68778959 is a deficient number, since it is larger than the sum of its proper divisors (1).

68778959 is an equidigital number, since it uses as much as digits as its factorization.

68778959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7620480, while the sum is 59.

The square root of 68778959 is about 8293.3080854385. The cubic root of 68778959 is about 409.7181465586.

The spelling of 68778959 in words is "sixty-eight million, seven hundred seventy-eight thousand, nine hundred fifty-nine".