101606111661 has 24 divisors (see below), whose sum is σ = 139145025024. Its totient is φ = 65948264320.

The previous prime is 101606111657. The next prime is 101606111671. The reversal of 101606111661 is 166111606101.

It is not a de Polignac number, because 101606111661 - 2² = 101606111657 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101606111611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1225621 + ... + 1305893.

It is an arithmetic number, because the mean of its divisors is an integer number (5797709376).

Almost surely, 2^101606111661 is an apocalyptic number.

It is an amenable number.

101606111661 is a deficient number, since it is larger than the sum of its proper divisors (37538913363).

101606111661 is an equidigital number, since it uses as much as digits as its factorization.

101606111661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80561 (or 80514 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 30.

Adding to 101606111661 its reverse (166111606101), we get a palindrome (267717717762).

The spelling of 101606111661 in words is "one hundred one billion, six hundred six million, one hundred eleven thousand, six hundred sixty-one".