161342440864 has 48 divisors (see below), whose sum is σ = 346573999296. Its totient is φ = 73325952000.

The previous prime is 161342440837. The next prime is 161342440873. The reversal of 161342440864 is 468044243161.

It is a self number, because there is not a number n which added to its sum of digits gives 161342440864.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2451589 + ... + 2516539.

It is an arithmetic number, because the mean of its divisors is an integer number (7220291652).

Almost surely, 2^161342440864 is an apocalyptic number.

It is an amenable number.

161342440864 is an abundant number, since it is smaller than the sum of its proper divisors (185231558432).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161342440864 is a wasteful number, since it uses less digits than its factorization.

161342440864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72029 (or 72021 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 43.

It can be divided in two parts, 161342 and 440864, that added together give a palindrome (602206).

The spelling of 161342440864 in words is "one hundred sixty-one billion, three hundred forty-two million, four hundred forty thousand, eight hundred sixty-four".