65115517 has 2 divisors, whose sum is σ = 65115518. Its totient is φ = 65115516.

The previous prime is 65115511. The next prime is 65115521. The reversal of 65115517 is 71551156.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42133081 + 22982436 = 6491^2 + 4794^2 .

It is a cyclic number.

It is not a de Polignac number, because 65115517 - 2¹⁹ = 64591229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65115511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32557758 + 32557759.

It is an arithmetic number, because the mean of its divisors is an integer number (32557759).

Almost surely, 2^65115517 is an apocalyptic number.

It is an amenable number.

65115517 is a deficient number, since it is larger than the sum of its proper divisors (1).

65115517 is an equidigital number, since it uses as much as digits as its factorization.

65115517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5250, while the sum is 31.

The square root of 65115517 is about 8069.4186283771. The cubic root of 65115517 is about 402.3106206301.

The spelling of 65115517 in words is "sixty-five million, one hundred fifteen thousand, five hundred seventeen".