65506511 has 4 divisors (see below), whose sum is σ = 74864592. Its totient is φ = 56148432.

The previous prime is 65506499. The next prime is 65506513. The reversal of 65506511 is 11560556.

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

It is a cyclic number.

It is not a de Polignac number, because 65506511 - 2¹⁴ = 65490127 is a prime.

It is a super-2 number, since 2×65506511² = 8582205966786242, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65506513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4679030 + ... + 4679043.

It is an arithmetic number, because the mean of its divisors is an integer number (18716148).

Almost surely, 2^65506511 is an apocalyptic number.

65506511 is a deficient number, since it is larger than the sum of its proper divisors (9358081).

65506511 is an equidigital number, since it uses as much as digits as its factorization.

65506511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9358080.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 65506511 is about 8093.6092690468. The cubic root of 65506511 is about 403.1142551951.

The spelling of 65506511 in words is "sixty-five million, five hundred six thousand, five hundred eleven".