405554045521 has 4 divisors (see below), whose sum is σ = 405847713844. Its totient is φ = 405260377200.

The previous prime is 405554045483. The next prime is 405554045537. The reversal of 405554045521 is 125540455504.

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 115964767296 + 289589278225 = 340536^2 + 538135^2 .

It is a cyclic number.

It is not a de Polignac number, because 405554045521 - 2¹⁵ = 405554012753 is a prime.

It is a super-2 number, since 2×405554045521² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405554045551) 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, 146832090 + ... + 146834851.

It is an arithmetic number, because the mean of its divisors is an integer number (101461928461).

Almost surely, 2^405554045521 is an apocalyptic number.

It is an amenable number.

405554045521 is a deficient number, since it is larger than the sum of its proper divisors (293668323).

405554045521 is a wasteful number, since it uses less digits than its factorization.

405554045521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293668322.

The product of its (nonzero) digits is 400000, while the sum is 40.

The spelling of 405554045521 in words is "four hundred five billion, five hundred fifty-four million, forty-five thousand, five hundred twenty-one".