245717806649 has 4 divisors (see below), whose sum is σ = 280820350464. Its totient is φ = 210615262836.

The previous prime is 245717806573. The next prime is 245717806661. The reversal of 245717806649 is 946608717542.

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 245717806649 - 2¹² = 245717802553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245717806669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17551271897 + ... + 17551271910.

It is an arithmetic number, because the mean of its divisors is an integer number (70205087616).

Almost surely, 2^245717806649 is an apocalyptic number.

It is an amenable number.

245717806649 is a deficient number, since it is larger than the sum of its proper divisors (35102543815).

245717806649 is an equidigital number, since it uses as much as digits as its factorization.

245717806649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35102543814.

The product of its (nonzero) digits is 20321280, while the sum is 59.

The spelling of 245717806649 in words is "two hundred forty-five billion, seven hundred seventeen million, eight hundred six thousand, six hundred forty-nine".