111551332161 has 16 divisors (see below), whose sum is σ = 152982670016. Its totient is φ = 72261697536.

The previous prime is 111551332097. The next prime is 111551332181. The reversal of 111551332161 is 161233155111.

It is not a de Polignac number, because 111551332161 - 2⁶ = 111551332097 is a prime.

It is a super-3 number, since 3×111551332161³ (a number of 34 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (111551332181) 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, 2215360 + ... + 2265153.

It is an arithmetic number, because the mean of its divisors is an integer number (9561416876).

Almost surely, 2^111551332161 is an apocalyptic number.

It is an amenable number.

111551332161 is a deficient number, since it is larger than the sum of its proper divisors (41431337855).

111551332161 is a wasteful number, since it uses less digits than its factorization.

111551332161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4480752.

The product of its digits is 2700, while the sum is 30.

Adding to 111551332161 its reverse (161233155111), we get a palindrome (272784487272).

The spelling of 111551332161 in words is "one hundred eleven billion, five hundred fifty-one million, three hundred thirty-two thousand, one hundred sixty-one".