505621453426 has 4 divisors (see below), whose sum is σ = 758432180142. Its totient is φ = 252810726712.

The previous prime is 505621453423. The next prime is 505621453427. The reversal of 505621453426 is 624354126505.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 624354126505 = 5 ⋅124870825301.

It can be written as a sum of positive squares in only one way, i.e., 498880879225 + 6740574201 = 706315^2 + 82101^2 .

It is not an unprimeable number, because it can be changed into a prime (505621453423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126405363355 + ... + 126405363358.

Almost surely, 2^505621453426 is an apocalyptic number.

505621453426 is a deficient number, since it is larger than the sum of its proper divisors (252810726716).

505621453426 is a wasteful number, since it uses less digits than its factorization.

505621453426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252810726715.

The product of its (nonzero) digits is 864000, while the sum is 43.

The spelling of 505621453426 in words is "five hundred five billion, six hundred twenty-one million, four hundred fifty-three thousand, four hundred twenty-six".