245436374502581 has 2 divisors, whose sum is σ = 245436374502582. Its totient is φ = 245436374502580.

The previous prime is 245436374502521. The next prime is 245436374502623. The reversal of 245436374502581 is 185205473634542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 236622844502500 + 8813530000081 = 15382550^2 + 2968759^2 .

It is a cyclic number.

It is not a de Polignac number, because 245436374502581 - 2¹⁸ = 245436374240437 is a prime.

It is a super-2 number, since 2×245436374502581² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 245436374502581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245436374502521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122718187251290 + 122718187251291.

It is an arithmetic number, because the mean of its divisors is an integer number (122718187251291).

Almost surely, 2^{245436374502581} is an apocalyptic number.

It is an amenable number.

245436374502581 is a deficient number, since it is larger than the sum of its proper divisors (1).

245436374502581 is an equidigital number, since it uses as much as digits as its factorization.

245436374502581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768000, while the sum is 59.

The spelling of 245436374502581 in words is "two hundred forty-five trillion, four hundred thirty-six billion, three hundred seventy-four million, five hundred two thousand, five hundred eighty-one".