65531611 has 4 divisors (see below), whose sum is σ = 65674224. Its totient is φ = 65389000.

The previous prime is 65531581. The next prime is 65531633. The reversal of 65531611 is 11613556.

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 65531611 - 2⁹ = 65531099 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 65531611.

It is not an unprimeable number, because it can be changed into a prime (65531681) 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, 70615 + ... + 71536.

It is an arithmetic number, because the mean of its divisors is an integer number (16418556).

Almost surely, 2^65531611 is an apocalyptic number.

65531611 is a deficient number, since it is larger than the sum of its proper divisors (142613).

65531611 is a wasteful number, since it uses less digits than its factorization.

65531611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142612.

The product of its digits is 2700, while the sum is 28.

The square root of 65531611 is about 8095.1597266515. The cubic root of 65531611 is about 403.1657354505.

The spelling of 65531611 in words is "sixty-five million, five hundred thirty-one thousand, six hundred eleven".