165600101661 has 4 divisors (see below), whose sum is σ = 220800135552. Its totient is φ = 110400067772.

The previous prime is 165600101609. The next prime is 165600101669. The reversal of 165600101661 is 166101006561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 165600101661 - 2³¹ = 163452618013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165600101669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27600016941 + ... + 27600016946.

It is an arithmetic number, because the mean of its divisors is an integer number (55200033888).

Almost surely, 2^165600101661 is an apocalyptic number.

It is an amenable number.

165600101661 is a deficient number, since it is larger than the sum of its proper divisors (55200033891).

165600101661 is an equidigital number, since it uses as much as digits as its factorization.

165600101661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55200033890.

The product of its (nonzero) digits is 6480, while the sum is 33.

The spelling of 165600101661 in words is "one hundred sixty-five billion, six hundred million, one hundred one thousand, six hundred sixty-one".