1638253325 has 12 divisors (see below), whose sum is σ = 2040390240. Its totient is φ = 1304824560.

The previous prime is 1638253319. The next prime is 1638253327. The reversal of 1638253325 is 5233528361.

It is not a de Polignac number, because 1638253325 - 2⁸ = 1638253069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1638253327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138665 + ... + 150014.

It is an arithmetic number, because the mean of its divisors is an integer number (170032520).

Almost surely, 2^1638253325 is an apocalyptic number.

It is an amenable number.

1638253325 is a deficient number, since it is larger than the sum of its proper divisors (402136915).

1638253325 is a wasteful number, since it uses less digits than its factorization.

1638253325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288916 (or 288911 counting only the distinct ones).

The product of its digits is 129600, while the sum is 38.

The square root of 1638253325 is about 40475.3421850884. The cubic root of 1638253325 is about 1178.8548991323.

The spelling of 1638253325 in words is "one billion, six hundred thirty-eight million, two hundred fifty-three thousand, three hundred twenty-five".