165243454406 has 16 divisors (see below), whose sum is σ = 250782155568. Its totient is φ = 81652428000.

The previous prime is 165243454361. The next prime is 165243454427. The reversal of 165243454406 is 604454342561.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 646760 + ... + 865323.

It is an arithmetic number, because the mean of its divisors is an integer number (15673884723).

Almost surely, 2^165243454406 is an apocalyptic number.

165243454406 is a deficient number, since it is larger than the sum of its proper divisors (85538701162).

165243454406 is a wasteful number, since it uses less digits than its factorization.

165243454406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1512727.

The product of its (nonzero) digits is 1382400, while the sum is 44.

Adding to 165243454406 its reverse (604454342561), we get a palindrome (769697796967).

The spelling of 165243454406 in words is "one hundred sixty-five billion, two hundred forty-three million, four hundred fifty-four thousand, four hundred six".