161800703581 has 8 divisors (see below), whose sum is σ = 176524979904. Its totient is φ = 147078947520.

The previous prime is 161800703573. The next prime is 161800703587. The reversal of 161800703581 is 185307008161.

161800703581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161800703581 - 2³ = 161800703573 is a prime.

It is a super-2 number, since 2×161800703581² (a number of 23 digits) contains 22 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 (161800703587) 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 7 ways as a sum of consecutive naturals, for example, 494556 + ... + 753781.

It is an arithmetic number, because the mean of its divisors is an integer number (22065622488).

Almost surely, 2^161800703581 is an apocalyptic number.

161800703581 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161800703581 is a deficient number, since it is larger than the sum of its proper divisors (14724276323).

161800703581 is a wasteful number, since it uses less digits than its factorization.

161800703581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260131.

The product of its (nonzero) digits is 40320, while the sum is 40.

The spelling of 161800703581 in words is "one hundred sixty-one billion, eight hundred million, seven hundred three thousand, five hundred eighty-one".