138525664 has 12 divisors (see below), whose sum is σ = 272722464. Its totient is φ = 69262816.

The previous prime is 138525659. The next prime is 138525671. The reversal of 138525664 is 466525831.

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, 2164432 + ... + 2164495.

It is an arithmetic number, because the mean of its divisors is an integer number (22726872).

Almost surely, 2^138525664 is an apocalyptic number.

It is an amenable number.

138525664 is a deficient number, since it is larger than the sum of its proper divisors (134196800).

138525664 is an equidigital number, since it uses as much as digits as its factorization.

138525664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4328937 (or 4328929 counting only the distinct ones).

The product of its digits is 172800, while the sum is 40.

The square root of 138525664 is about 11769.6926043121. The cubic root of 138525664 is about 517.4202405336.

The spelling of 138525664 in words is "one hundred thirty-eight million, five hundred twenty-five thousand, six hundred sixty-four".