116561511661 has 16 divisors (see below), whose sum is σ = 136177574400. Its totient is φ = 97690619520.

The previous prime is 116561511631. The next prime is 116561511707. The reversal of 116561511661 is 166115165611.

It is a cyclic number.

It is not a de Polignac number, because 116561511661 - 2⁷ = 116561511533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (116561511611) 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, 176251 + ... + 513991.

It is an arithmetic number, because the mean of its divisors is an integer number (8511098400).

Almost surely, 2^116561511661 is an apocalyptic number.

It is an amenable number.

116561511661 is a deficient number, since it is larger than the sum of its proper divisors (19616062739).

116561511661 is a wasteful number, since it uses less digits than its factorization.

116561511661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338844.

The product of its digits is 32400, while the sum is 40.

The spelling of 116561511661 in words is "one hundred sixteen billion, five hundred sixty-one million, five hundred eleven thousand, six hundred sixty-one".