405440020555 has 4 divisors (see below), whose sum is σ = 486528024672. Its totient is φ = 324352016440.

The previous prime is 405440020553. The next prime is 405440020591. The reversal of 405440020555 is 555020044504.

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

It is not a de Polignac number, because 405440020555 - 2¹ = 405440020553 is a prime.

It is a super-2 number, since 2×405440020555² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 405440020555.

It is not an unprimeable number, because it can be changed into a prime (405440020553) 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, 40544002051 + ... + 40544002060.

It is an arithmetic number, because the mean of its divisors is an integer number (121632006168).

Almost surely, 2^405440020555 is an apocalyptic number.

405440020555 is a deficient number, since it is larger than the sum of its proper divisors (81088004117).

405440020555 is an equidigital number, since it uses as much as digits as its factorization.

405440020555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81088004116.

The product of its (nonzero) digits is 80000, while the sum is 34.

The spelling of 405440020555 in words is "four hundred five billion, four hundred forty million, twenty thousand, five hundred fifty-five".