505142555440 has 80 divisors (see below), whose sum is σ = 1188569998080. Its totient is φ = 199637273600.

The previous prime is 505142555429. The next prime is 505142555483. The reversal of 505142555440 is 44555241505.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 505142555393 and 505142555402.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3805062 + ... + 3935578.

It is an arithmetic number, because the mean of its divisors is an integer number (14857124976).

Almost surely, 2^505142555440 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 505142555440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (594284999040).

505142555440 is an abundant number, since it is smaller than the sum of its proper divisors (683427442640).

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

505142555440 is a wasteful number, since it uses less digits than its factorization.

505142555440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131110 (or 131104 counting only the distinct ones).

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

Adding to 505142555440 its reverse (44555241505), we get a palindrome (549697796945).

The spelling of 505142555440 in words is "five hundred five billion, one hundred forty-two million, five hundred fifty-five thousand, four hundred forty".