19679078065 has 4 divisors (see below), whose sum is σ = 23614893684. Its totient is φ = 15743262448.

The previous prime is 19679077973. The next prime is 19679078137. The reversal of 19679078065 is 56087097691.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15038607424 + 4640470641 = 122632^2 + 68121^2 .

It is a cyclic number.

It is not a de Polignac number, because 19679078065 - 2⁷ = 19679077937 is a prime.

It is a super-2 number, since 2×19679078065² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1967907802 + ... + 1967907811.

It is an arithmetic number, because the mean of its divisors is an integer number (5903723421).

Almost surely, 2^19679078065 is an apocalyptic number.

It is an amenable number.

19679078065 is a deficient number, since it is larger than the sum of its proper divisors (3935815619).

19679078065 is an equidigital number, since it uses as much as digits as its factorization.

19679078065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3935815618.

The product of its (nonzero) digits is 5715360, while the sum is 58.

The spelling of 19679078065 in words is "nineteen billion, six hundred seventy-nine million, seventy-eight thousand, sixty-five".