161705662001 has 4 divisors (see below), whose sum is σ = 174144559092. Its totient is φ = 149266764912.

The previous prime is 161705661991. The next prime is 161705662009. The reversal of 161705662001 is 100266507161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 102559422001 + 59146240000 = 320249^2 + 243200^2 .

It is a cyclic number.

It is not a de Polignac number, because 161705662001 - 2²⁶ = 161638553137 is a prime.

It is a super-2 number, since 2×161705662001² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161705662009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6219448526 + ... + 6219448551.

It is an arithmetic number, because the mean of its divisors is an integer number (43536139773).

Almost surely, 2^161705662001 is an apocalyptic number.

It is an amenable number.

161705662001 is a deficient number, since it is larger than the sum of its proper divisors (12438897091).

161705662001 is a wasteful number, since it uses less digits than its factorization.

161705662001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12438897090.

The product of its (nonzero) digits is 15120, while the sum is 35.

The spelling of 161705662001 in words is "one hundred sixty-one billion, seven hundred five million, six hundred sixty-two thousand, one".