161211250001 has 8 divisors (see below), whose sum is σ = 162786209664. Its totient is φ = 159636479040.

The previous prime is 161211249959. The next prime is 161211250063. The reversal of 161211250001 is 100052112161.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161211250001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161211250601) 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, 2180300 + ... + 2253026.

It is an arithmetic number, because the mean of its divisors is an integer number (20348276208).

Almost surely, 2^161211250001 is an apocalyptic number.

It is an amenable number.

161211250001 is a deficient number, since it is larger than the sum of its proper divisors (1574959663).

161211250001 is a wasteful number, since it uses less digits than its factorization.

161211250001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94351.

The product of its (nonzero) digits is 120, while the sum is 20.

Adding to 161211250001 its reverse (100052112161), we get a palindrome (261263362162).

The spelling of 161211250001 in words is "one hundred sixty-one billion, two hundred eleven million, two hundred fifty thousand, one".