245316226781 has 2 divisors, whose sum is σ = 245316226782. Its totient is φ = 245316226780.

The previous prime is 245316226741. The next prime is 245316226787. The reversal of 245316226781 is 187622613542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 169286988025 + 76029238756 = 411445^2 + 275734^2 .

It is a cyclic number.

It is not a de Polignac number, because 245316226781 - 2²² = 245312032477 is a prime.

It is a super-2 number, since 2×245316226781² (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 (245316226787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122658113390 + 122658113391.

It is an arithmetic number, because the mean of its divisors is an integer number (122658113391).

Almost surely, 2^245316226781 is an apocalyptic number.

It is an amenable number.

245316226781 is a deficient number, since it is larger than the sum of its proper divisors (1).

245316226781 is an equidigital number, since it uses as much as digits as its factorization.

245316226781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 47.

The spelling of 245316226781 in words is "two hundred forty-five billion, three hundred sixteen million, two hundred twenty-six thousand, seven hundred eighty-one".