66219054400 has 42 divisors (see below), whose sum is σ = 162940264670. Its totient is φ = 26487621120.

The previous prime is 66219054371. The next prime is 66219054431. The reversal of 66219054400 is 445091266.

It can be written as a sum of positive squares in 3 ways, for example, as 14096337984 + 52122716416 = 118728^2 + 228304^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66219054400.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20691855 + ... + 20695054.

Almost surely, 2^66219054400 is an apocalyptic number.

It is an amenable number.

66219054400 is an abundant number, since it is smaller than the sum of its proper divisors (96721210270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66219054400 is a wasteful number, since it uses less digits than its factorization.

66219054400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41386931 (or 41386916 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 66219054400 in words is "sixty-six billion, two hundred nineteen million, fifty-four thousand, four hundred".