245316220781 has 2 divisors, whose sum is σ = 245316220782. Its totient is φ = 245316220780.

The previous prime is 245316220763. The next prime is 245316220829. The reversal of 245316220781 is 187022613542.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 243922393225 + 1393827556 = 493885^2 + 37334^2 .

It is a cyclic number.

It is not a de Polignac number, because 245316220781 - 2³⁰ = 244242478957 is a prime.

It is a super-2 number, since 2×245316220781² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245316226781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122658110390 + 122658110391.

It is an arithmetic number, because the mean of its divisors is an integer number (122658110391).

Almost surely, 2^245316220781 is an apocalyptic number.

It is an amenable number.

245316220781 is a deficient number, since it is larger than the sum of its proper divisors (1).

245316220781 is an equidigital number, since it uses as much as digits as its factorization.

245316220781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 41.

The spelling of 245316220781 in words is "two hundred forty-five billion, three hundred sixteen million, two hundred twenty thousand, seven hundred eighty-one".