209753797457 has 8 divisors (see below), whose sum is σ = 209946815520. Its totient is φ = 209560871520.

The previous prime is 209753797447. The next prime is 209753797481. The reversal of 209753797457 is 754797357902.

209753797457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209753797457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 209753797393 and 209753797402.

It is not an unprimeable number, because it can be changed into a prime (209753797447) 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 7 ways as a sum of consecutive naturals, for example, 5028794 + ... + 5070332.

It is an arithmetic number, because the mean of its divisors is an integer number (26243351940).

Almost surely, 2^209753797457 is an apocalyptic number.

It is an amenable number.

209753797457 is a deficient number, since it is larger than the sum of its proper divisors (193018063).

209753797457 is a wasteful number, since it uses less digits than its factorization.

209753797457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46063.

The product of its (nonzero) digits is 116688600, while the sum is 65.

The spelling of 209753797457 in words is "two hundred nine billion, seven hundred fifty-three million, seven hundred ninety-seven thousand, four hundred fifty-seven".