161806802895 has 48 divisors (see below), whose sum is σ = 288750745920. Its totient is φ = 83758966272.

The previous prime is 161806802891. The next prime is 161806802917. The reversal of 161806802895 is 598208608161.

It is a happy number.

It is not a de Polignac number, because 161806802895 - 2² = 161806802891 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161806802891) 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, 562182 + ... + 799788.

It is an arithmetic number, because the mean of its divisors is an integer number (6015640540).

Almost surely, 2^161806802895 is an apocalyptic number.

161806802895 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161806802895 is a deficient number, since it is larger than the sum of its proper divisors (126943943025).

161806802895 is a wasteful number, since it uses less digits than its factorization.

161806802895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238064 (or 238061 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 54.

The spelling of 161806802895 in words is "one hundred sixty-one billion, eight hundred six million, eight hundred two thousand, eight hundred ninety-five".