19697664209111 has 4 divisors (see below), whose sum is σ = 22511616238992. Its totient is φ = 16883712179232.

The previous prime is 19697664209107. The next prime is 19697664209137. The reversal of 19697664209111 is 11190246679691.

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

It is a cyclic number.

It is not a de Polignac number, because 19697664209111 - 2² = 19697664209107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19697664209911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1406976014930 + ... + 1406976014943.

It is an arithmetic number, because the mean of its divisors is an integer number (5627904059748).

Almost surely, 2^{19697664209111} is an apocalyptic number.

19697664209111 is a deficient number, since it is larger than the sum of its proper divisors (2813952029881).

19697664209111 is an equidigital number, since it uses as much as digits as its factorization.

19697664209111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2813952029880.

The product of its (nonzero) digits is 8817984, while the sum is 62.

The spelling of 19697664209111 in words is "nineteen trillion, six hundred ninety-seven billion, six hundred sixty-four million, two hundred nine thousand, one hundred eleven".