161203645001 has 8 divisors (see below), whose sum is σ = 195069957120. Its totient is φ = 130046637888.

The previous prime is 161203644997. The next prime is 161203645003. The reversal of 161203645001 is 100546302161.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161203645001 - 2² = 161203644997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161203645003) 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 7 ways as a sum of consecutive naturals, for example, 677326121 + ... + 677326358.

It is an arithmetic number, because the mean of its divisors is an integer number (24383744640).

Almost surely, 2^161203645001 is an apocalyptic number.

It is an amenable number.

161203645001 is a deficient number, since it is larger than the sum of its proper divisors (33866312119).

161203645001 is a wasteful number, since it uses less digits than its factorization.

161203645001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354652503.

The product of its (nonzero) digits is 4320, while the sum is 29.

Adding to 161203645001 its reverse (100546302161), we get a palindrome (261749947162).

The spelling of 161203645001 in words is "one hundred sixty-one billion, two hundred three million, six hundred forty-five thousand, one".