65981519 has 2 divisors, whose sum is σ = 65981520. Its totient is φ = 65981518.

The previous prime is 65981501. The next prime is 65981543. The reversal of 65981519 is 91518956.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65981519 - 2²⁴ = 49204303 is a prime.

It is a super-2 number, since 2×65981519² = 8707121699094722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65981519.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65981569) 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 as a sum of consecutive naturals, namely, 32990759 + 32990760.

It is an arithmetic number, because the mean of its divisors is an integer number (32990760).

Almost surely, 2^65981519 is an apocalyptic number.

65981519 is a deficient number, since it is larger than the sum of its proper divisors (1).

65981519 is an equidigital number, since it uses as much as digits as its factorization.

65981519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 44.

The square root of 65981519 is about 8122.9008980782. The cubic root of 65981519 is about 404.0862782597.

The spelling of 65981519 in words is "sixty-five million, nine hundred eighty-one thousand, five hundred nineteen".