245702556689 has 2 divisors, whose sum is σ = 245702556690. Its totient is φ = 245702556688.

The previous prime is 245702556653. The next prime is 245702556719. The reversal of 245702556689 is 986655207542.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 239113176064 + 6589380625 = 488992^2 + 81175^2 .

It is a cyclic number.

It is not a de Polignac number, because 245702556689 - 2⁸ = 245702556433 is a prime.

It is a super-2 number, since 2×245702556689² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (245702556089) 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 as a sum of consecutive naturals, namely, 122851278344 + 122851278345.

It is an arithmetic number, because the mean of its divisors is an integer number (122851278345).

Almost surely, 2^245702556689 is an apocalyptic number.

It is an amenable number.

245702556689 is a deficient number, since it is larger than the sum of its proper divisors (1).

245702556689 is an equidigital number, since it uses as much as digits as its factorization.

245702556689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288000, while the sum is 59.

The spelling of 245702556689 in words is "two hundred forty-five billion, seven hundred two million, five hundred fifty-six thousand, six hundred eighty-nine".