160631780681 has 4 divisors (see below), whose sum is σ = 160632867972. Its totient is φ = 160630693392.

The previous prime is 160631780671. The next prime is 160631780689. The reversal of 160631780681 is 186087136061.

160631780681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 145191481600 + 15440299081 = 381040^2 + 124259^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-160631780681 is a prime.

It is a super-2 number, since 2×160631780681² (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 (160631780689) 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 3 ways as a sum of consecutive naturals, for example, 279146 + ... + 631811.

It is an arithmetic number, because the mean of its divisors is an integer number (40158216993).

Almost surely, 2^160631780681 is an apocalyptic number.

It is an amenable number.

160631780681 is a deficient number, since it is larger than the sum of its proper divisors (1087291).

160631780681 is an equidigital number, since it uses as much as digits as its factorization.

160631780681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1087290.

The product of its (nonzero) digits is 290304, while the sum is 47.

The spelling of 160631780681 in words is "one hundred sixty billion, six hundred thirty-one million, seven hundred eighty thousand, six hundred eighty-one".