65442511 has 4 divisors (see below), whose sum is σ = 65731032. Its totient is φ = 65153992.

The previous prime is 65442497. The next prime is 65442523. The reversal of 65442511 is 11524456.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65442511 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65442511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65442551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143920 + ... + 144373.

It is an arithmetic number, because the mean of its divisors is an integer number (16432758).

Almost surely, 2^65442511 is an apocalyptic number.

65442511 is a deficient number, since it is larger than the sum of its proper divisors (288521).

65442511 is a wasteful number, since it uses less digits than its factorization.

65442511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288520.

The product of its digits is 4800, while the sum is 28.

The square root of 65442511 is about 8089.6545661728. The cubic root of 65442511 is about 402.9829312574.

Adding to 65442511 its reverse (11524456), we get a palindrome (76966967).

The spelling of 65442511 in words is "sixty-five million, four hundred forty-two thousand, five hundred eleven".