1968693157 has 2 divisors, whose sum is σ = 1968693158. Its totient is φ = 1968693156.

The previous prime is 1968693121. The next prime is 1968693163. The reversal of 1968693157 is 7513968691.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1483328196 + 485364961 = 38514^2 + 22031^2 .

It is a cyclic number.

It is not a de Polignac number, because 1968693157 - 2⁷ = 1968693029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1968693098 and 1968693107.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1968693457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984346578 + 984346579.

It is an arithmetic number, because the mean of its divisors is an integer number (984346579).

Almost surely, 2^1968693157 is an apocalyptic number.

It is an amenable number.

1968693157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1968693157 is an equidigital number, since it uses as much as digits as its factorization.

1968693157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2449440, while the sum is 55.

The square root of 1968693157 is about 44369.9578205795. The cubic root of 1968693157 is about 1253.3124213650.

The spelling of 1968693157 in words is "one billion, nine hundred sixty-eight million, six hundred ninety-three thousand, one hundred fifty-seven".