65197997 has 4 divisors (see below), whose sum is σ = 65262876. Its totient is φ = 65133120.

The previous prime is 65197981. The next prime is 65197999. The reversal of 65197997 is 79979156.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40883236 + 24314761 = 6394^2 + 4931^2 .

It is a cyclic number.

It is not a de Polignac number, because 65197997 - 2⁴ = 65197981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65197999) 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 in 3 ways as a sum of consecutive naturals, for example, 30908 + ... + 32949.

It is an arithmetic number, because the mean of its divisors is an integer number (16315719).

Almost surely, 2^65197997 is an apocalyptic number.

It is an amenable number.

65197997 is a deficient number, since it is larger than the sum of its proper divisors (64879).

65197997 is a wasteful number, since it uses less digits than its factorization.

65197997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64878.

The product of its digits is 1071630, while the sum is 53.

The square root of 65197997 is about 8074.5276642043. The cubic root of 65197997 is about 402.4804141544.

The spelling of 65197997 in words is "sixty-five million, one hundred ninety-seven thousand, nine hundred ninety-seven".