505263621621451 has 16 divisors (see below), whose sum is σ = 643342019466240. Its totient is φ = 385335063737280.

The previous prime is 505263621621433. The next prime is 505263621621497. The reversal of 505263621621451 is 154126126362505.

It is a cyclic number.

It is not a de Polignac number, because 505263621621451 - 2⁷ = 505263621621323 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 505263621621395 and 505263621621404.

It is not an unprimeable number, because it can be changed into a prime (505263621621851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69807073146 + ... + 69807080383.

It is an arithmetic number, because the mean of its divisors is an integer number (40208876216640).

Almost surely, 2^{505263621621451} is an apocalyptic number.

505263621621451 is a deficient number, since it is larger than the sum of its proper divisors (138078397844789).

505263621621451 is a wasteful number, since it uses less digits than its factorization.

505263621621451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139614153594.

The product of its (nonzero) digits is 2592000, while the sum is 49.

Adding to 505263621621451 its reverse (154126126362505), we get a palindrome (659389747983956).

The spelling of 505263621621451 in words is "five hundred five trillion, two hundred sixty-three billion, six hundred twenty-one million, six hundred twenty-one thousand, four hundred fifty-one".