111666534 has 64 divisors (see below), whose sum is σ = 275304960. Its totient is φ = 29479680.

The previous prime is 111666479. The next prime is 111666551. The reversal of 111666534 is 435666111.

It is a junction number, because it is equal to n+sod(n) for n = 111666495 and 111666504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31012 + ... + 34424.

It is an arithmetic number, because the mean of its divisors is an integer number (4301640).

Almost surely, 2^111666534 is an apocalyptic number.

111666534 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 111666534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (137652480).

111666534 is an abundant number, since it is smaller than the sum of its proper divisors (163638426).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111666534 is a wasteful number, since it uses less digits than its factorization.

111666534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3485.

The product of its digits is 12960, while the sum is 33.

The square root of 111666534 is about 10567.2387121707. The cubic root of 111666534 is about 481.5495841079.

The spelling of 111666534 in words is "one hundred eleven million, six hundred sixty-six thousand, five hundred thirty-four".