5011661111 has 4 divisors (see below), whose sum is σ = 5067972000. Its totient is φ = 4955350224.

The previous prime is 5011661099. The next prime is 5011661113. The reversal of 5011661111 is 1111661105.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1111661105 = 5 ⋅222332221.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5011661111 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 (5011661113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28155311 + ... + 28155488.

It is an arithmetic number, because the mean of its divisors is an integer number (1266993000).

Almost surely, 2^5011661111 is an apocalyptic number.

5011661111 is a deficient number, since it is larger than the sum of its proper divisors (56310889).

5011661111 is an equidigital number, since it uses as much as digits as its factorization.

5011661111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56310888.

The product of its (nonzero) digits is 180, while the sum is 23.

The square root of 5011661111 is about 70793.0866045548. The cubic root of 5011661111 is about 1711.3042625235.

The spelling of 5011661111 in words is "five billion, eleven million, six hundred sixty-one thousand, one hundred eleven".