161440511306 has 4 divisors (see below), whose sum is σ = 242160766962. Its totient is φ = 80720255652.

The previous prime is 161440511291. The next prime is 161440511321. The reversal of 161440511306 is 603115044161.

161440511306 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 an interprime number because it is at equal distance from previous prime (161440511291) and next prime (161440511321).

It can be written as a sum of positive squares in only one way, i.e., 126622817281 + 34817694025 = 355841^2 + 186595^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 40360127825 + ... + 40360127828.

Almost surely, 2^161440511306 is an apocalyptic number.

161440511306 is a deficient number, since it is larger than the sum of its proper divisors (80720255656).

161440511306 is an equidigital number, since it uses as much as digits as its factorization.

161440511306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80720255655.

The product of its (nonzero) digits is 8640, while the sum is 32.

Adding to 161440511306 its reverse (603115044161), we get a palindrome (764555555467).

The spelling of 161440511306 in words is "one hundred sixty-one billion, four hundred forty million, five hundred eleven thousand, three hundred six".