161580533827 has 4 divisors (see below), whose sum is σ = 163625857120. Its totient is φ = 159535210536.

The previous prime is 161580533767. The next prime is 161580533843. The reversal of 161580533827 is 728335085161.

161580533827 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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161580533827 is a prime.

It is a super-2 number, since 2×161580533827² (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 (161580533867) 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, 1022661528 + ... + 1022661685.

It is an arithmetic number, because the mean of its divisors is an integer number (40906464280).

Almost surely, 2^161580533827 is an apocalyptic number.

161580533827 is a deficient number, since it is larger than the sum of its proper divisors (2045323293).

161580533827 is an equidigital number, since it uses as much as digits as its factorization.

161580533827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2045323292.

The product of its (nonzero) digits is 1209600, while the sum is 49.

The spelling of 161580533827 in words is "one hundred sixty-one billion, five hundred eighty million, five hundred thirty-three thousand, eight hundred twenty-seven".