19711698085 has 4 divisors (see below), whose sum is σ = 23654037708. Its totient is φ = 15769358464.

The previous prime is 19711698079. The next prime is 19711698109. The reversal of 19711698085 is 58089611791.

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 10176370884 + 9535327201 = 100878^2 + 97649^2 .

It is a cyclic number.

It is not a de Polignac number, because 19711698085 - 2¹⁵ = 19711665317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1971169804 + ... + 1971169813.

It is an arithmetic number, because the mean of its divisors is an integer number (5913509427).

Almost surely, 2^19711698085 is an apocalyptic number.

It is an amenable number.

19711698085 is a deficient number, since it is larger than the sum of its proper divisors (3942339623).

19711698085 is an equidigital number, since it uses as much as digits as its factorization.

19711698085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3942339622.

The product of its (nonzero) digits is 1088640, while the sum is 55.

The spelling of 19711698085 in words is "nineteen billion, seven hundred eleven million, six hundred ninety-eight thousand, eighty-five".