245891447993 has 2 divisors, whose sum is σ = 245891447994. Its totient is φ = 245891447992.

The previous prime is 245891447909. The next prime is 245891448017. The reversal of 245891447993 is 399744198542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 241486736569 + 4404711424 = 491413^2 + 66368^2 .

It is a cyclic number.

It is not a de Polignac number, because 245891447993 - 2¹⁴ = 245891431609 is a prime.

It is not a weakly prime, because it can be changed into another prime (245891447903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122945723996 + 122945723997.

It is an arithmetic number, because the mean of its divisors is an integer number (122945723997).

Almost surely, 2^245891447993 is an apocalyptic number.

It is an amenable number.

245891447993 is a deficient number, since it is larger than the sum of its proper divisors (1).

245891447993 is an equidigital number, since it uses as much as digits as its factorization.

245891447993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78382080, while the sum is 65.

The spelling of 245891447993 in words is "two hundred forty-five billion, eight hundred ninety-one million, four hundred forty-seven thousand, nine hundred ninety-three".