1638416125 has 16 divisors (see below), whose sum is σ = 2057013504. Its totient is φ = 1302867600.

The previous prime is 1638416107. The next prime is 1638416137. The reversal of 1638416125 is 5216148361.

It is a happy number.

It is not a de Polignac number, because 1638416125 - 2¹³ = 1638407933 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, 18369 + ... + 60118.

It is an arithmetic number, because the mean of its divisors is an integer number (128563344).

Almost surely, 2^1638416125 is an apocalyptic number.

It is an amenable number.

1638416125 is a deficient number, since it is larger than the sum of its proper divisors (418597379).

1638416125 is an equidigital number, since it uses as much as digits as its factorization.

1638416125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78669 (or 78659 counting only the distinct ones).

The product of its digits is 34560, while the sum is 37.

The square root of 1638416125 is about 40477.3532360998. The cubic root of 1638416125 is about 1178.8939470658.

The spelling of 1638416125 in words is "one billion, six hundred thirty-eight million, four hundred sixteen thousand, one hundred twenty-five".