65617819 has 2 divisors, whose sum is σ = 65617820. Its totient is φ = 65617818.

The previous prime is 65617801. The next prime is 65617823. The reversal of 65617819 is 91871656.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65617819 - 2¹³ = 65609627 is a prime.

It is a super-2 number, since 2×65617819² = 8611396340633522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65617829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32808909 + 32808910.

It is an arithmetic number, because the mean of its divisors is an integer number (32808910).

Almost surely, 2^65617819 is an apocalyptic number.

65617819 is a deficient number, since it is larger than the sum of its proper divisors (1).

65617819 is an equidigital number, since it uses as much as digits as its factorization.

65617819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 43.

The square root of 65617819 is about 8100.4826399419. The cubic root of 65617819 is about 403.3424485490.

The spelling of 65617819 in words is "sixty-five million, six hundred seventeen thousand, eight hundred nineteen".