65617997 has 2 divisors, whose sum is σ = 65617998. Its totient is φ = 65617996.

The previous prime is 65617967. The next prime is 65618029. The reversal of 65617997 is 79971656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52215076 + 13402921 = 7226^2 + 3661^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65617997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65617907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32808998 + 32808999.

It is an arithmetic number, because the mean of its divisors is an integer number (32808999).

Almost surely, 2^65617997 is an apocalyptic number.

It is an amenable number.

65617997 is a deficient number, since it is larger than the sum of its proper divisors (1).

65617997 is an equidigital number, since it uses as much as digits as its factorization.

65617997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 714420, while the sum is 50.

The square root of 65617997 is about 8100.4936269341. The cubic root of 65617997 is about 403.3428132614.

The spelling of 65617997 in words is "sixty-five million, six hundred seventeen thousand, nine hundred ninety-seven".