161256043405 has 8 divisors (see below), whose sum is σ = 193526812512. Its totient is φ = 128991794448.

The previous prime is 161256043397. The next prime is 161256043441. The reversal of 161256043405 is 504340652161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161256043405 - 2³ = 161256043397 is a prime.

It is a Duffinian 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, 1575459 + ... + 1674688.

It is an arithmetic number, because the mean of its divisors is an integer number (24190851564).

Almost surely, 2^161256043405 is an apocalyptic number.

It is an amenable number.

161256043405 is a deficient number, since it is larger than the sum of its proper divisors (32270769107).

161256043405 is an equidigital number, since it uses as much as digits as its factorization.

161256043405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3260075.

The product of its (nonzero) digits is 86400, while the sum is 37.

Adding to 161256043405 its reverse (504340652161), we get a palindrome (665596695566).

The spelling of 161256043405 in words is "one hundred sixty-one billion, two hundred fifty-six million, forty-three thousand, four hundred five".