65915138 has 4 divisors (see below), whose sum is σ = 98872710. Its totient is φ = 32957568.

The previous prime is 65915119. The next prime is 65915147. The reversal of 65915138 is 83151956.

65915138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 39526369 + 26388769 = 6287^2 + 5137^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 16478783 + ... + 16478786.

Almost surely, 2^65915138 is an apocalyptic number.

65915138 is a deficient number, since it is larger than the sum of its proper divisors (32957572).

65915138 is a wasteful number, since it uses less digits than its factorization.

65915138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32957571.

The product of its digits is 32400, while the sum is 38.

The square root of 65915138 is about 8118.8138296182. The cubic root of 65915138 is about 403.9507218593.

The spelling of 65915138 in words is "sixty-five million, nine hundred fifteen thousand, one hundred thirty-eight".