161841006865791 has 48 divisors (see below), whose sum is σ = 261924583609728. Its totient is φ = 95430893342400.

The previous prime is 161841006865789. The next prime is 161841006865841. The reversal of 161841006865791 is 197568600148161.

161841006865791 is a `hidden beast` number, since 1 + 6 + 1 + 8 + 410 + 0 + 6 + 86 + 57 + 91 = 666.

It is not a de Polignac number, because 161841006865791 - 2¹ = 161841006865789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161841006865751) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 97680220 + ... + 99323246.

It is an arithmetic number, because the mean of its divisors is an integer number (5456762158536).

Almost surely, 2^{161841006865791} is an apocalyptic number.

161841006865791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161841006865791 is a deficient number, since it is larger than the sum of its proper divisors (100083576743937).

161841006865791 is a wasteful number, since it uses less digits than its factorization.

161841006865791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1669972 (or 1669969 counting only the distinct ones).

The product of its (nonzero) digits is 17418240, while the sum is 63.

The spelling of 161841006865791 in words is "one hundred sixty-one trillion, eight hundred forty-one billion, six million, eight hundred sixty-five thousand, seven hundred ninety-one".