505404406556 has 72 divisors (see below), whose sum is σ = 1083592581120. Its totient is φ = 205091302752.

The previous prime is 505404406531. The next prime is 505404406589. The reversal of 505404406556 is 655604404505.

It is a super-2 number, since 2×505404406556² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7066085 + ... + 7137251.

It is an arithmetic number, because the mean of its divisors is an integer number (15049896960).

Almost surely, 2^505404406556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 505404406556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (541796290560).

505404406556 is an abundant number, since it is smaller than the sum of its proper divisors (578188174564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

505404406556 is a wasteful number, since it uses less digits than its factorization.

505404406556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73111 (or 73102 counting only the distinct ones).

The product of its (nonzero) digits is 1440000, while the sum is 44.

The spelling of 505404406556 in words is "five hundred five billion, four hundred four million, four hundred six thousand, five hundred fifty-six".