2164446551 has 4 divisors (see below), whose sum is σ = 2164575000. Its totient is φ = 2164318104.

The previous prime is 2164446517. The next prime is 2164446553. The reversal of 2164446551 is 1556444612.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2164446551 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 (2164446553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34301 + ... + 74198.

It is an arithmetic number, because the mean of its divisors is an integer number (541143750).

Almost surely, 2^2164446551 is an apocalyptic number.

2164446551 is a deficient number, since it is larger than the sum of its proper divisors (128449).

2164446551 is a wasteful number, since it uses less digits than its factorization.

2164446551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128448.

The product of its digits is 115200, while the sum is 38.

The square root of 2164446551 is about 46523.6128326251. The cubic root of 2164446551 is about 1293.5472249088.

The spelling of 2164446551 in words is "two billion, one hundred sixty-four million, four hundred forty-six thousand, five hundred fifty-one".