1638167245 has 16 divisors (see below), whose sum is σ = 2309473152. Its totient is φ = 1099748160.

The previous prime is 1638167189. The next prime is 1638167287. The reversal of 1638167245 is 5427618361.

It is not a de Polignac number, because 1638167245 - 2¹⁹ = 1637642957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1144857 + ... + 1146286.

It is an arithmetic number, because the mean of its divisors is an integer number (144342072).

Almost surely, 2^1638167245 is an apocalyptic number.

It is an amenable number.

1638167245 is a deficient number, since it is larger than the sum of its proper divisors (671305907).

1638167245 is a wasteful number, since it uses less digits than its factorization.

1638167245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2291172.

The product of its digits is 241920, while the sum is 43.

The square root of 1638167245 is about 40474.2788076576. The cubic root of 1638167245 is about 1178.8342516118.

The spelling of 1638167245 in words is "one billion, six hundred thirty-eight million, one hundred sixty-seven thousand, two hundred forty-five".