111551001066 has 32 divisors (see below), whose sum is σ = 247928016000. Its totient is φ = 37178131680.

The previous prime is 111551001031. The next prime is 111551001071. The reversal of 111551001066 is 660100155111.

111551001066 is a `hidden beast` number, since 1 + 1 + 1 + 551 + 0 + 0 + 106 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 220710 + ... + 521358.

It is an arithmetic number, because the mean of its divisors is an integer number (7747750500).

Almost surely, 2^111551001066 is an apocalyptic number.

111551001066 is an abundant number, since it is smaller than the sum of its proper divisors (136377014934).

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

111551001066 is a wasteful number, since it uses less digits than its factorization.

111551001066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307531 (or 307525 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 27.

Adding to 111551001066 its reverse (660100155111), we get a palindrome (771651156177).

The spelling of 111551001066 in words is "one hundred eleven billion, five hundred fifty-one million, one thousand, sixty-six".