405420612161 has 4 divisors (see below), whose sum is σ = 419400633300. Its totient is φ = 391440591024.

The previous prime is 405420612139. The next prime is 405420612199. The reversal of 405420612161 is 161216024504.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 143743348225 + 261677263936 = 379135^2 + 511544^2 .

It is a cyclic number.

It is not a de Polignac number, because 405420612161 - 2¹⁰ = 405420611137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405420612101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6990010526 + ... + 6990010583.

It is an arithmetic number, because the mean of its divisors is an integer number (104850158325).

Almost surely, 2^405420612161 is an apocalyptic number.

It is an amenable number.

405420612161 is a deficient number, since it is larger than the sum of its proper divisors (13980021139).

405420612161 is a wasteful number, since it uses less digits than its factorization.

405420612161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13980021138.

The product of its (nonzero) digits is 11520, while the sum is 32.

Adding to 405420612161 its reverse (161216024504), we get a palindrome (566636636665).

The spelling of 405420612161 in words is "four hundred five billion, four hundred twenty million, six hundred twelve thousand, one hundred sixty-one".