2111017778309 has 4 divisors (see below), whose sum is σ = 2302928485440. Its totient is φ = 1919107071180.

The previous prime is 2111017778281. The next prime is 2111017778339. The reversal of 2111017778309 is 9038777101112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2111017778309 - 2¹² = 2111017774213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111017778339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95955353549 + ... + 95955353570.

It is an arithmetic number, because the mean of its divisors is an integer number (575732121360).

Almost surely, 2^{2111017778309} is an apocalyptic number.

It is an amenable number.

2111017778309 is a deficient number, since it is larger than the sum of its proper divisors (191910707131).

2111017778309 is a wasteful number, since it uses less digits than its factorization.

2111017778309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191910707130.

The product of its (nonzero) digits is 148176, while the sum is 47.

The spelling of 2111017778309 in words is "two trillion, one hundred eleven billion, seventeen million, seven hundred seventy-eight thousand, three hundred nine".