111561631423671 has 32 divisors (see below), whose sum is σ = 174758075089920. Its totient is φ = 62410604745600.

The previous prime is 111561631423663. The next prime is 111561631423673. The reversal of 111561631423671 is 176324136165111.

It is a happy number.

It is not a de Polignac number, because 111561631423671 - 2³ = 111561631423663 is a prime.

It is a super-2 number, since 2×111561631423671² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 111561631423671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111561631423673) 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, 14912610 + ... + 21107088.

It is an arithmetic number, because the mean of its divisors is an integer number (5461189846560).

Almost surely, 2^{111561631423671} is an apocalyptic number.

111561631423671 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111561631423671 is a deficient number, since it is larger than the sum of its proper divisors (63196443666249).

111561631423671 is a wasteful number, since it uses less digits than its factorization.

111561631423671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6236487.

The product of its digits is 544320, while the sum is 48.

Adding to 111561631423671 its reverse (176324136165111), we get a palindrome (287885767588782).

The spelling of 111561631423671 in words is "one hundred eleven trillion, five hundred sixty-one billion, six hundred thirty-one million, four hundred twenty-three thousand, six hundred seventy-one".