161646344001 has 6 divisors (see below), whose sum is σ = 233489163570. Its totient is φ = 107764229328.

The previous prime is 161646343997. The next prime is 161646344009. The reversal of 161646344001 is 100443646161.

161646344001 is a `hidden beast` number, since 1 + 6 + 1 + 646 + 3 + 4 + 4 + 0 + 0 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 115719710976 + 45926633025 = 340176^2 + 214305^2 .

It is not a de Polignac number, because 161646344001 - 2² = 161646343997 is a prime.

It is a super-2 number, since 2×161646344001² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161646344009) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8980352436 + ... + 8980352453.

It is an arithmetic number, because the mean of its divisors is an integer number (38914860595).

Almost surely, 2^161646344001 is an apocalyptic number.

It is an amenable number.

161646344001 is a deficient number, since it is larger than the sum of its proper divisors (71842819569).

161646344001 is a wasteful number, since it uses less digits than its factorization.

161646344001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17960704895 (or 17960704892 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The spelling of 161646344001 in words is "one hundred sixty-one billion, six hundred forty-six million, three hundred forty-four thousand, one".