11111868554 has 4 divisors (see below), whose sum is σ = 16667802834. Its totient is φ = 5555934276.

The previous prime is 11111868539. The next prime is 11111868569. The reversal of 11111868554 is 45586811111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45586811111 = 7129 ⋅6394559.

It is an interprime number because it is at equal distance from previous prime (11111868539) and next prime (11111868569).

It can be written as a sum of positive squares in only one way, i.e., 6659376025 + 4452492529 = 81605^2 + 66727^2 .

It is a super-2 number, since 2×11111868554² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2777967137 + ... + 2777967140.

Almost surely, 2^11111868554 is an apocalyptic number.

11111868554 is a deficient number, since it is larger than the sum of its proper divisors (5555934280).

11111868554 is an equidigital number, since it uses as much as digits as its factorization.

11111868554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5555934279.

The product of its digits is 38400, while the sum is 41.

The spelling of 11111868554 in words is "eleven billion, one hundred eleven million, eight hundred sixty-eight thousand, five hundred fifty-four".