450513215521 has 4 divisors (see below), whose sum is σ = 450594117700. Its totient is φ = 450432313344.

The previous prime is 450513215479. The next prime is 450513215533. The reversal of 450513215521 is 125512315054.

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 75234455521 + 375278760000 = 274289^2 + 612600^2 .

It is a cyclic number.

It is not a de Polignac number, because 450513215521 - 2⁷ = 450513215393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (454513215521) 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, 40442736 + ... + 40453873.

It is an arithmetic number, because the mean of its divisors is an integer number (112648529425).

Almost surely, 2^450513215521 is an apocalyptic number.

It is an amenable number.

450513215521 is a deficient number, since it is larger than the sum of its proper divisors (80902179).

450513215521 is an equidigital number, since it uses as much as digits as its factorization.

450513215521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80902178.

The product of its (nonzero) digits is 30000, while the sum is 34.

The spelling of 450513215521 in words is "four hundred fifty billion, five hundred thirteen million, two hundred fifteen thousand, five hundred twenty-one".