636605231461 has 2 divisors, whose sum is σ = 636605231462. Its totient is φ = 636605231460.

The previous prime is 636605231413. The next prime is 636605231491. The reversal of 636605231461 is 164132506636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 400316882436 + 236288349025 = 632706^2 + 486095^2 .

It is a cyclic number.

It is not a de Polignac number, because 636605231461 - 2¹³ = 636605223269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (636605231411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318302615730 + 318302615731.

It is an arithmetic number, because the mean of its divisors is an integer number (318302615731).

Almost surely, 2^636605231461 is an apocalyptic number.

It is an amenable number.

636605231461 is a deficient number, since it is larger than the sum of its proper divisors (1).

636605231461 is an equidigital number, since it uses as much as digits as its factorization.

636605231461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 43.

The spelling of 636605231461 in words is "six hundred thirty-six billion, six hundred five million, two hundred thirty-one thousand, four hundred sixty-one".