161541178801 has 4 divisors (see below), whose sum is σ = 163050909552. Its totient is φ = 160031448052.

The previous prime is 161541178783. The next prime is 161541178831. The reversal of 161541178801 is 108871145161.

161541178801 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 108871145161 = 176699 ⋅616139.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161541178801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161541178831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 754865215 + ... + 754865428.

It is an arithmetic number, because the mean of its divisors is an integer number (40762727388).

Almost surely, 2^161541178801 is an apocalyptic number.

It is an amenable number.

161541178801 is a deficient number, since it is larger than the sum of its proper divisors (1509730751).

161541178801 is a wasteful number, since it uses less digits than its factorization.

161541178801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1509730750.

The product of its (nonzero) digits is 53760, while the sum is 43.

The spelling of 161541178801 in words is "one hundred sixty-one billion, five hundred forty-one million, one hundred seventy-eight thousand, eight hundred one".