100611591661 has 12 divisors (see below), whose sum is σ = 119528146368. Its totient is φ = 84403643352.

The previous prime is 100611591599. The next prime is 100611591671. The reversal of 100611591661 is 166195116001.

It is a happy number.

It is not a de Polignac number, because 100611591661 - 2⁹ = 100611591149 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 100611591661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100611591671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21841291 + ... + 21845896.

It is an arithmetic number, because the mean of its divisors is an integer number (9960678864).

Almost surely, 2^100611591661 is an apocalyptic number.

It is an amenable number.

100611591661 is a deficient number, since it is larger than the sum of its proper divisors (18916554707).

100611591661 is an equidigital number, since it uses as much as digits as its factorization.

100611591661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43687248 (or 43687241 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 37.

The spelling of 100611591661 in words is "one hundred billion, six hundred eleven million, five hundred ninety-one thousand, six hundred sixty-one".