180381740681 has 4 divisors (see below), whose sum is σ = 180382590612. Its totient is φ = 180380890752.

The previous prime is 180381740647. The next prime is 180381740689. The reversal of 180381740681 is 186047183081.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 8757965056 + 171623775625 = 93584^2 + 414275^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-180381740681 is a prime.

It is a super-2 number, since 2×180381740681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (180381740689) 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, 190565 + ... + 630141.

It is an arithmetic number, because the mean of its divisors is an integer number (45095647653).

Almost surely, 2^180381740681 is an apocalyptic number.

It is an amenable number.

180381740681 is a deficient number, since it is larger than the sum of its proper divisors (849931).

180381740681 is an equidigital number, since it uses as much as digits as its factorization.

180381740681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849930.

The product of its (nonzero) digits is 258048, while the sum is 47.

The spelling of 180381740681 in words is "one hundred eighty billion, three hundred eighty-one million, seven hundred forty thousand, six hundred eighty-one".