1968665019 has 16 divisors (see below), whose sum is σ = 2676432672. Its totient is φ = 1286707968.

The previous prime is 1968664961. The next prime is 1968665021. The reversal of 1968665019 is 9105668691.

It is not a de Polignac number, because 1968665019 - 2⁷ = 1968664891 is a prime.

It is a super-2 number, since 2×1968665019² = 7751283914068540722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1968665099) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 250047 + ... + 257799.

It is an arithmetic number, because the mean of its divisors is an integer number (167277042).

Almost surely, 2^1968665019 is an apocalyptic number.

1968665019 is a deficient number, since it is larger than the sum of its proper divisors (707767653).

1968665019 is a wasteful number, since it uses less digits than its factorization.

1968665019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9406.

The product of its (nonzero) digits is 699840, while the sum is 51.

The square root of 1968665019 is about 44369.6407355300. The cubic root of 1968665019 is about 1253.3064502511.

The spelling of 1968665019 in words is "one billion, nine hundred sixty-eight million, six hundred sixty-five thousand, nineteen".