840197722465 has 4 divisors (see below), whose sum is σ = 1008237266964. Its totient is φ = 672158177968.

The previous prime is 840197722433. The next prime is 840197722523. The reversal of 840197722465 is 564227791048.

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 472748379489 + 367449342976 = 687567^2 + 606176^2 .

It is a cyclic number.

It is not a de Polignac number, because 840197722465 - 2⁵ = 840197722433 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84019772242 + ... + 84019772251.

It is an arithmetic number, because the mean of its divisors is an integer number (252059316741).

Almost surely, 2^840197722465 is an apocalyptic number.

It is an amenable number.

840197722465 is a deficient number, since it is larger than the sum of its proper divisors (168039544499).

840197722465 is a wasteful number, since it uses less digits than its factorization.

840197722465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168039544498.

The product of its (nonzero) digits is 6773760, while the sum is 55.

The spelling of 840197722465 in words is "eight hundred forty billion, one hundred ninety-seven million, seven hundred twenty-two thousand, four hundred sixty-five".