380161811561 has 4 divisors (see below), whose sum is σ = 434470641792. Its totient is φ = 325852981332.

The previous prime is 380161811539. The next prime is 380161811593. The reversal of 380161811561 is 165118161083.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 380161811561 - 2¹⁰ = 380161810537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (380161811531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27154415105 + ... + 27154415118.

It is an arithmetic number, because the mean of its divisors is an integer number (108617660448).

Almost surely, 2^380161811561 is an apocalyptic number.

It is an amenable number.

380161811561 is a deficient number, since it is larger than the sum of its proper divisors (54308830231).

380161811561 is an equidigital number, since it uses as much as digits as its factorization.

380161811561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54308830230.

The product of its (nonzero) digits is 34560, while the sum is 41.

The spelling of 380161811561 in words is "three hundred eighty billion, one hundred sixty-one million, eight hundred eleven thousand, five hundred sixty-one".