418800666521 has 4 divisors (see below), whose sum is σ = 430119603492. Its totient is φ = 407481729552.

The previous prime is 418800666481. The next prime is 418800666601. The reversal of 418800666521 is 125666008814.

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 161154073600 + 257646592921 = 401440^2 + 507589^2 .

It is a cyclic number.

It is not a de Polignac number, because 418800666521 - 2¹⁸ = 418800404377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (418800566521) 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, 5659468430 + ... + 5659468503.

It is an arithmetic number, because the mean of its divisors is an integer number (107529900873).

Almost surely, 2^418800666521 is an apocalyptic number.

It is an amenable number.

418800666521 is a deficient number, since it is larger than the sum of its proper divisors (11318936971).

418800666521 is a wasteful number, since it uses less digits than its factorization.

418800666521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11318936970.

The product of its (nonzero) digits is 552960, while the sum is 47.

The spelling of 418800666521 in words is "four hundred eighteen billion, eight hundred million, six hundred sixty-six thousand, five hundred twenty-one".