111604503661 has 16 divisors (see below), whose sum is σ = 129385273600. Its totient is φ = 94292149248.

The previous prime is 111604503653. The next prime is 111604503683. The reversal of 111604503661 is 166305406111.

It is a cyclic number.

It is not a de Polignac number, because 111604503661 - 2³ = 111604503653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111604503601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 231681 + ... + 526198.

It is an arithmetic number, because the mean of its divisors is an integer number (8086579600).

Almost surely, 2^111604503661 is an apocalyptic number.

It is an amenable number.

111604503661 is a deficient number, since it is larger than the sum of its proper divisors (17780769939).

111604503661 is a wasteful number, since it uses less digits than its factorization.

111604503661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758188.

The product of its (nonzero) digits is 12960, while the sum is 34.

Adding to 111604503661 its reverse (166305406111), we get a palindrome (277909909772).

The spelling of 111604503661 in words is "one hundred eleven billion, six hundred four million, five hundred three thousand, six hundred sixty-one".