65115511 has 2 divisors, whose sum is σ = 65115512. Its totient is φ = 65115510.

The previous prime is 65115497. The next prime is 65115517. The reversal of 65115511 is 11551156.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65115511 - 2⁷ = 65115383 is a prime.

It is a super-2 number, since 2×65115511² = 8480059545582242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65115517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32557755 + 32557756.

It is an arithmetic number, because the mean of its divisors is an integer number (32557756).

Almost surely, 2^65115511 is an apocalyptic number.

65115511 is a deficient number, since it is larger than the sum of its proper divisors (1).

65115511 is an equidigital number, since it uses as much as digits as its factorization.

65115511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 750, while the sum is 25.

The square root of 65115511 is about 8069.4182566031. The cubic root of 65115511 is about 402.3106082732.

Adding to 65115511 its reverse (11551156), we get a palindrome (76666667).

The spelling of 65115511 in words is "sixty-five million, one hundred fifteen thousand, five hundred eleven".