111666262616661 has 32 divisors (see below), whose sum is σ = 159210110037888. Its totient is φ = 69370187110400.

The previous prime is 111666262616659. The next prime is 111666262616759. The reversal of 111666262616661 is 166616262666111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 111666262616661 - 2¹ = 111666262616659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111666262616621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 365243686 + ... + 365549288.

It is an arithmetic number, because the mean of its divisors is an integer number (4975315938684).

Almost surely, 2^{111666262616661} is an apocalyptic number.

It is an amenable number.

111666262616661 is a deficient number, since it is larger than the sum of its proper divisors (47543847421227).

111666262616661 is a wasteful number, since it uses less digits than its factorization.

111666262616661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376661.

The product of its digits is 6718464, while the sum is 57.

The spelling of 111666262616661 in words is "one hundred eleven trillion, six hundred sixty-six billion, two hundred sixty-two million, six hundred sixteen thousand, six hundred sixty-one".