505123356653 has 4 divisors (see below), whose sum is σ = 510124578108. Its totient is φ = 500122135200.

The previous prime is 505123356631. The next prime is 505123356709. The reversal of 505123356653 is 356653321505.

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 391191455209 + 113931901444 = 625453^2 + 337538^2 .

It is a cyclic number.

It is not a de Polignac number, because 505123356653 - 2⁶ = 505123356589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505123356613) 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, 2500610576 + ... + 2500610777.

It is an arithmetic number, because the mean of its divisors is an integer number (127531144527).

Almost surely, 2^505123356653 is an apocalyptic number.

It is an amenable number.

505123356653 is a deficient number, since it is larger than the sum of its proper divisors (5001221455).

505123356653 is a wasteful number, since it uses less digits than its factorization.

505123356653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5001221454.

The product of its (nonzero) digits is 1215000, while the sum is 44.

The spelling of 505123356653 in words is "five hundred five billion, one hundred twenty-three million, three hundred fifty-six thousand, six hundred fifty-three".