161543223641 has 16 divisors (see below), whose sum is σ = 165516307200. Its totient is φ = 157625079360.

The previous prime is 161543223631. The next prime is 161543223679. The reversal of 161543223641 is 146322345161.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161543223641 is a prime.

It is a super-2 number, since 2×161543223641² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161543223595 and 161543223604.

It is not an unprimeable number, because it can be changed into a prime (161543223631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2902820 + ... + 2957946.

It is an arithmetic number, because the mean of its divisors is an integer number (10344769200).

Almost surely, 2^161543223641 is an apocalyptic number.

It is an amenable number.

161543223641 is a deficient number, since it is larger than the sum of its proper divisors (3973083559).

161543223641 is a wasteful number, since it uses less digits than its factorization.

161543223641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55624.

The product of its digits is 103680, while the sum is 38.

The spelling of 161543223641 in words is "one hundred sixty-one billion, five hundred forty-three million, two hundred twenty-three thousand, six hundred forty-one".