13644009461 has 2 divisors, whose sum is σ = 13644009462. Its totient is φ = 13644009460.

The previous prime is 13644009451. The next prime is 13644009557. The reversal of 13644009461 is 16490044631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13249391236 + 394618225 = 115106^2 + 19865^2 .

It is a cyclic number.

It is not a de Polignac number, because 13644009461 - 2²² = 13639815157 is a prime.

It is a super-4 number, since 4×13644009461⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13644009451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6822004730 + 6822004731.

It is an arithmetic number, because the mean of its divisors is an integer number (6822004731).

Almost surely, 2^13644009461 is an apocalyptic number.

It is an amenable number.

13644009461 is a deficient number, since it is larger than the sum of its proper divisors (1).

13644009461 is an equidigital number, since it uses as much as digits as its factorization.

13644009461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 38.

The spelling of 13644009461 in words is "thirteen billion, six hundred forty-four million, nine thousand, four hundred sixty-one".