13561660523 has 2 divisors, whose sum is σ = 13561660524. Its totient is φ = 13561660522.

The previous prime is 13561660507. The next prime is 13561660547. The reversal of 13561660523 is 32506616531.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13561660523 - 2⁴ = 13561660507 is a prime.

It is a super-2 number, since 2×13561660523² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13561660573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6780830261 + 6780830262.

It is an arithmetic number, because the mean of its divisors is an integer number (6780830262).

Almost surely, 2^13561660523 is an apocalyptic number.

13561660523 is a deficient number, since it is larger than the sum of its proper divisors (1).

13561660523 is an equidigital number, since it uses as much as digits as its factorization.

13561660523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 38.

The spelling of 13561660523 in words is "thirteen billion, five hundred sixty-one million, six hundred sixty thousand, five hundred twenty-three".