10005511111 has 4 divisors (see below), whose sum is σ = 10006119952. Its totient is φ = 10004902272.

The previous prime is 10005511079. The next prime is 10005511157. The reversal of 10005511111 is 11111550001.

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 10005511111 - 2⁵ = 10005511079 is a prime.

It is a super-2 number, since 2×10005511111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10005511171) 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, 279066 + ... + 312871.

It is an arithmetic number, because the mean of its divisors is an integer number (2501529988).

Almost surely, 2^10005511111 is an apocalyptic number.

10005511111 is a deficient number, since it is larger than the sum of its proper divisors (608841).

10005511111 is an equidigital number, since it uses as much as digits as its factorization.

10005511111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608840.

The product of its (nonzero) digits is 25, while the sum is 16.

The spelling of 10005511111 in words is "ten billion, five million, five hundred eleven thousand, one hundred eleven".