65840973197 has 4 divisors (see below), whose sum is σ = 66153015936. Its totient is φ = 65528930460.

The previous prime is 65840973193. The next prime is 65840973199. The reversal of 65840973197 is 79137904856.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 65840973197 - 2² = 65840973193 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 (65840973193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156021053 + ... + 156021474.

It is an arithmetic number, because the mean of its divisors is an integer number (16538253984).

Almost surely, 2^65840973197 is an apocalyptic number.

It is an amenable number.

65840973197 is a deficient number, since it is larger than the sum of its proper divisors (312042739).

65840973197 is a wasteful number, since it uses less digits than its factorization.

65840973197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312042738.

The product of its (nonzero) digits is 11430720, while the sum is 59.

The spelling of 65840973197 in words is "sixty-five billion, eight hundred forty million, nine hundred seventy-three thousand, one hundred ninety-seven".