13566940969 has 4 divisors (see below), whose sum is σ = 13567340160. Its totient is φ = 13566541780.

The previous prime is 13566940943. The next prime is 13566941039. The reversal of 13566940969 is 96904966531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96904966531 = 276763 ⋅350137.

It is a cyclic number.

It is not a de Polignac number, because 13566940969 - 2¹⁹ = 13566416681 is a prime.

It is a super-2 number, since 2×13566940969² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13566940939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143329 + ... + 218350.

It is an arithmetic number, because the mean of its divisors is an integer number (3391835040).

Almost surely, 2^13566940969 is an apocalyptic number.

It is an amenable number.

13566940969 is a deficient number, since it is larger than the sum of its proper divisors (399191).

13566940969 is an equidigital number, since it uses as much as digits as its factorization.

13566940969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399190.

The product of its (nonzero) digits is 9447840, while the sum is 58.

The spelling of 13566940969 in words is "thirteen billion, five hundred sixty-six million, nine hundred forty thousand, nine hundred sixty-nine".