19973977937911 has 2 divisors, whose sum is σ = 19973977937912. Its totient is φ = 19973977937910.

The previous prime is 19973977937899. The next prime is 19973977937929. The reversal of 19973977937911 is 11973977937991.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19973977937911 - 2⁷ = 19973977937783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19973977337911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9986988968955 + 9986988968956.

It is an arithmetic number, because the mean of its divisors is an integer number (9986988968956).

Almost surely, 2^{19973977937911} is an apocalyptic number.

19973977937911 is a deficient number, since it is larger than the sum of its proper divisors (1).

19973977937911 is an equidigital number, since it uses as much as digits as its factorization.

19973977937911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1275989841, while the sum is 82.

The spelling of 19973977937911 in words is "nineteen trillion, nine hundred seventy-three billion, nine hundred seventy-seven million, nine hundred thirty-seven thousand, nine hundred eleven".