161806803287 has 4 divisors (see below), whose sum is σ = 161812547736. Its totient is φ = 161801058840.

The previous prime is 161806803281. The next prime is 161806803307. The reversal of 161806803287 is 782308608161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 782308608161 = 67 ⋅11676247883.

It is a cyclic number.

It is not a de Polignac number, because 161806803287 - 2¹⁶ = 161806737751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161806803281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2829764 + ... + 2886377.

It is an arithmetic number, because the mean of its divisors is an integer number (40453136934).

Almost surely, 2^161806803287 is an apocalyptic number.

161806803287 is a deficient number, since it is larger than the sum of its proper divisors (5744449).

161806803287 is an equidigital number, since it uses as much as digits as its factorization.

161806803287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5744448.

The product of its (nonzero) digits is 774144, while the sum is 50.

The spelling of 161806803287 in words is "one hundred sixty-one billion, eight hundred six million, eight hundred three thousand, two hundred eighty-seven".