65172511 has 4 divisors (see below), whose sum is σ = 65203024. Its totient is φ = 65142000.

The previous prime is 65172491. The next prime is 65172539. The reversal of 65172511 is 11527156.

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 65172511 - 2⁷ = 65172383 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 65172511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65172581) 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, 11790 + ... + 16411.

It is an arithmetic number, because the mean of its divisors is an integer number (16300756).

Almost surely, 2^65172511 is an apocalyptic number.

65172511 is a deficient number, since it is larger than the sum of its proper divisors (30513).

65172511 is a wasteful number, since it uses less digits than its factorization.

65172511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30512.

The product of its digits is 2100, while the sum is 28.

The square root of 65172511 is about 8072.9493371382. The cubic root of 65172511 is about 402.4279639097.

Adding to 65172511 its reverse (11527156), we get a palindrome (76699667).

The spelling of 65172511 in words is "sixty-five million, one hundred seventy-two thousand, five hundred eleven".