161418094493 has 4 divisors (see below), whose sum is σ = 170913276540. Its totient is φ = 151922912448.

The previous prime is 161418094471. The next prime is 161418094507. The reversal of 161418094493 is 394490814161.

161418094493 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 an emirpimes, since its reverse is a distinct semiprime: 394490814161 = 478769 ⋅823969.

It can be written as a sum of positive squares in 2 ways, for example, as 111894933049 + 49523161444 = 334507^2 + 222538^2 .

It is a cyclic number.

It is not a de Polignac number, because 161418094493 - 2⁸ = 161418094237 is a prime.

It is a super-3 number, since 3×161418094493³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161418094463) 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, 4747590998 + ... + 4747591031.

It is an arithmetic number, because the mean of its divisors is an integer number (42728319135).

Almost surely, 2^161418094493 is an apocalyptic number.

It is an amenable number.

161418094493 is a deficient number, since it is larger than the sum of its proper divisors (9495182047).

161418094493 is an equidigital number, since it uses as much as digits as its factorization.

161418094493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9495182046.

The product of its (nonzero) digits is 746496, while the sum is 50.

The spelling of 161418094493 in words is "one hundred sixty-one billion, four hundred eighteen million, ninety-four thousand, four hundred ninety-three".