161747143655 has 4 divisors (see below), whose sum is σ = 194096572392. Its totient is φ = 129397714920.

The previous prime is 161747143643. The next prime is 161747143673. The reversal of 161747143655 is 556341747161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 556341747161 = 61091 ⋅9106771.

It is not a de Polignac number, because 161747143655 - 2⁴ = 161747143639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16174714361 + ... + 16174714370.

It is an arithmetic number, because the mean of its divisors is an integer number (48524143098).

Almost surely, 2^161747143655 is an apocalyptic number.

161747143655 is a deficient number, since it is larger than the sum of its proper divisors (32349428737).

161747143655 is an equidigital number, since it uses as much as digits as its factorization.

161747143655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32349428736.

The product of its digits is 2116800, while the sum is 50.

The spelling of 161747143655 in words is "one hundred sixty-one billion, seven hundred forty-seven million, one hundred forty-three thousand, six hundred fifty-five".