161153644381 has 4 divisors (see below), whose sum is σ = 161154447264. Its totient is φ = 161152841500.

The previous prime is 161153644373. The next prime is 161153644387. The reversal of 161153644381 is 183446351161.

161153644381 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 Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 161153644381 - 2³ = 161153644373 is a prime.

It is a super-2 number, since 2×161153644381² (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 (161153644387) 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, 199056 + ... + 601606.

It is an arithmetic number, because the mean of its divisors is an integer number (40288611816).

Almost surely, 2^161153644381 is an apocalyptic number.

It is an amenable number.

161153644381 is a deficient number, since it is larger than the sum of its proper divisors (802883).

161153644381 is an equidigital number, since it uses as much as digits as its factorization.

161153644381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802882.

The product of its digits is 207360, while the sum is 43.

The spelling of 161153644381 in words is "one hundred sixty-one billion, one hundred fifty-three million, six hundred forty-four thousand, three hundred eighty-one".