79900111111 has 2 divisors, whose sum is σ = 79900111112. Its totient is φ = 79900111110.

The previous prime is 79900111097. The next prime is 79900111121. The reversal of 79900111111 is 11111100997.

It is a strong prime.

It is an emirp because it is prime and its reverse (11111100997) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79900111111 is a prime.

79900111111 is a modest number, since divided by 111111 gives 79900 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79900111121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39950055555 + 39950055556.

It is an arithmetic number, because the mean of its divisors is an integer number (39950055556).

Almost surely, 2^79900111111 is an apocalyptic number.

79900111111 is a deficient number, since it is larger than the sum of its proper divisors (1).

79900111111 is an equidigital number, since it uses as much as digits as its factorization.

79900111111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 567, while the sum is 31.

The spelling of 79900111111 in words is "seventy-nine billion, nine hundred million, one hundred eleven thousand, one hundred eleven".