1968558691 has 8 divisors (see below), whose sum is σ = 2179571904. Its totient is φ = 1762887720.

The previous prime is 1968558677. The next prime is 1968558703.

1968558691 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1968558691 - 2²⁵ = 1935004259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1968558671) 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 7 ways as a sum of consecutive naturals, for example, 1334785 + ... + 1336258.

It is an arithmetic number, because the mean of its divisors is an integer number (272446488).

Almost surely, 2^1968558691 is an apocalyptic number.

1968558691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1968558691 is a deficient number, since it is larger than the sum of its proper divisors (211013213).

1968558691 is a wasteful number, since it uses less digits than its factorization.

1968558691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2671121.

The product of its digits is 4665600, while the sum is 58.

The square root of 1968558691 is about 44368.4425126688. The cubic root of 1968558691 is about 1253.2838860657.

The spelling of 1968558691 in words is "one billion, nine hundred sixty-eight million, five hundred fifty-eight thousand, six hundred ninety-one".