13640509573 has 2 divisors, whose sum is σ = 13640509574. Its totient is φ = 13640509572.

The previous prime is 13640509523. The next prime is 13640509601. The reversal of 13640509573 is 37590504631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13633364644 + 7144929 = 116762^2 + 2673^2 .

It is an emirp because it is prime and its reverse (37590504631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13640509573 - 2⁹ = 13640509061 is a prime.

It is a super-2 number, since 2×13640509573² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13640509523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6820254786 + 6820254787.

It is an arithmetic number, because the mean of its divisors is an integer number (6820254787).

Almost surely, 2^13640509573 is an apocalyptic number.

It is an amenable number.

13640509573 is a deficient number, since it is larger than the sum of its proper divisors (1).

13640509573 is an equidigital number, since it uses as much as digits as its factorization.

13640509573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 340200, while the sum is 43.

The spelling of 13640509573 in words is "thirteen billion, six hundred forty million, five hundred nine thousand, five hundred seventy-three".