2553221966 has 4 divisors (see below), whose sum is σ = 3829832952. Its totient is φ = 1276610982.

The previous prime is 2553221933. The next prime is 2553221971. The reversal of 2553221966 is 6691223552.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638305490 + ... + 638305493.

It is an arithmetic number, because the mean of its divisors is an integer number (957458238).

Almost surely, 2^2553221966 is an apocalyptic number.

2553221966 is a deficient number, since it is larger than the sum of its proper divisors (1276610986).

2553221966 is a wasteful number, since it uses less digits than its factorization.

2553221966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1276610985.

The product of its digits is 194400, while the sum is 41.

The square root of 2553221966 is about 50529.4168381152. The cubic root of 2553221966 is about 1366.7723699193.

The spelling of 2553221966 in words is "two billion, five hundred fifty-three million, two hundred twenty-one thousand, nine hundred sixty-six".