404555520401 has 4 divisors (see below), whose sum is σ = 428352903972. Its totient is φ = 380758136832.

The previous prime is 404555520379. The next prime is 404555520403. The reversal of 404555520401 is 104025555404.

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 220322278225 + 184233242176 = 469385^2 + 429224^2 .

It is a cyclic number.

It is not a de Polignac number, because 404555520401 - 2²² = 404551326097 is a prime.

It is a super-3 number, since 3×404555520401³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (404555520403) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 11898691760 + ... + 11898691793.

It is an arithmetic number, because the mean of its divisors is an integer number (107088225993).

Almost surely, 2^404555520401 is an apocalyptic number.

It is an amenable number.

404555520401 is a deficient number, since it is larger than the sum of its proper divisors (23797383571).

404555520401 is a wasteful number, since it uses less digits than its factorization.

404555520401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23797383570.

The product of its (nonzero) digits is 80000, while the sum is 35.

The spelling of 404555520401 in words is "four hundred four billion, five hundred fifty-five million, five hundred twenty thousand, four hundred one".