111651101661 has 8 divisors (see below), whose sum is σ = 162401602464. Its totient is φ = 67667334320.

The previous prime is 111651101647. The next prime is 111651101677. The reversal of 111651101661 is 166101156111.

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 111651101661 - 2¹⁷ = 111650970589 is a prime.

It is a super-2 number, since 2×111651101661² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111651101461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1691683326 + ... + 1691683391.

It is an arithmetic number, because the mean of its divisors is an integer number (20300200308).

Almost surely, 2^111651101661 is an apocalyptic number.

111651101661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111651101661 is a deficient number, since it is larger than the sum of its proper divisors (50750500803).

111651101661 is a wasteful number, since it uses less digits than its factorization.

111651101661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3383366731.

The product of its (nonzero) digits is 1080, while the sum is 30.

Adding to 111651101661 its reverse (166101156111), we get a palindrome (277752257772).

It can be divided in two parts, 111651 and 101661, that added together give a palindrome (213312).

The spelling of 111651101661 in words is "one hundred eleven billion, six hundred fifty-one million, one hundred one thousand, six hundred sixty-one".