111664321555 has 8 divisors (see below), whose sum is σ = 135997144272. Its totient is φ = 87998151648.

The previous prime is 111664321547. The next prime is 111664321591. The reversal of 111664321555 is 555123466111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 111664321555 - 2³ = 111664321547 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166662832 + ... + 166663501.

It is an arithmetic number, because the mean of its divisors is an integer number (16999643034).

Almost surely, 2^111664321555 is an apocalyptic number.

111664321555 is a deficient number, since it is larger than the sum of its proper divisors (24332822717).

111664321555 is an equidigital number, since it uses as much as digits as its factorization.

111664321555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333326405.

The product of its digits is 108000, while the sum is 40.

Adding to 111664321555 its reverse (555123466111), we get a palindrome (666787787666).

The spelling of 111664321555 in words is "one hundred eleven billion, six hundred sixty-four million, three hundred twenty-one thousand, five hundred fifty-five".