636742451489 has 2 divisors, whose sum is σ = 636742451490. Its totient is φ = 636742451488.

The previous prime is 636742451473. The next prime is 636742451549. The reversal of 636742451489 is 984154247636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 361345254400 + 275397197089 = 601120^2 + 524783^2 .

It is a cyclic number.

It is not a de Polignac number, because 636742451489 - 2⁴ = 636742451473 is a prime.

It is not a weakly prime, because it can be changed into another prime (636742451459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318371225744 + 318371225745.

It is an arithmetic number, because the mean of its divisors is an integer number (318371225745).

Almost surely, 2^636742451489 is an apocalyptic number.

It is an amenable number.

636742451489 is a deficient number, since it is larger than the sum of its proper divisors (1).

636742451489 is an equidigital number, since it uses as much as digits as its factorization.

636742451489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34836480, while the sum is 59.

The spelling of 636742451489 in words is "six hundred thirty-six billion, seven hundred forty-two million, four hundred fifty-one thousand, four hundred eighty-nine".