1968658993 has 16 divisors (see below), whose sum is σ = 2325206016. Its totient is φ = 1631669760.

The previous prime is 1968658957. The next prime is 1968659003. The reversal of 1968658993 is 3998568691.

It is a happy number.

It is not a de Polignac number, because 1968658993 - 2¹⁷ = 1968527921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1968658903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2080 + ... + 62782.

It is an arithmetic number, because the mean of its divisors is an integer number (145325376).

Almost surely, 2^1968658993 is an apocalyptic number.

It is an amenable number.

1968658993 is a deficient number, since it is larger than the sum of its proper divisors (356547023).

1968658993 is a wasteful number, since it uses less digits than its factorization.

1968658993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60864.

The product of its digits is 25194240, while the sum is 64.

The square root of 1968658993 is about 44369.5728286852. The cubic root of 1968658993 is about 1253.3051714772.

The spelling of 1968658993 in words is "one billion, nine hundred sixty-eight million, six hundred fifty-eight thousand, nine hundred ninety-three".