65011538 has 4 divisors (see below), whose sum is σ = 97517310. Its totient is φ = 32505768.

The previous prime is 65011523. The next prime is 65011561. The reversal of 65011538 is 83511056.

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., 43731769 + 21279769 = 6613^2 + 4613^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 65011538.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16252883 + ... + 16252886.

Almost surely, 2^65011538 is an apocalyptic number.

65011538 is a deficient number, since it is larger than the sum of its proper divisors (32505772).

65011538 is a wasteful number, since it uses less digits than its factorization.

65011538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32505771.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 65011538 is about 8062.9732729310. The cubic root of 65011538 is about 402.0963647764.

The spelling of 65011538 in words is "sixty-five million, eleven thousand, five hundred thirty-eight".