450815721557 has 4 divisors (see below), whose sum is σ = 454365451776. Its totient is φ = 447265991340.

The previous prime is 450815721539. The next prime is 450815721563. The reversal of 450815721557 is 755127518054.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 450815721557 - 2²⁴ = 450798944341 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 (450815721527) 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, 1774864919 + ... + 1774865172.

It is an arithmetic number, because the mean of its divisors is an integer number (113591362944).

Almost surely, 2^450815721557 is an apocalyptic number.

It is an amenable number.

450815721557 is a deficient number, since it is larger than the sum of its proper divisors (3549730219).

450815721557 is a wasteful number, since it uses less digits than its factorization.

450815721557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3549730218.

The product of its (nonzero) digits is 1960000, while the sum is 50.

The spelling of 450815721557 in words is "four hundred fifty billion, eight hundred fifteen million, seven hundred twenty-one thousand, five hundred fifty-seven".