13577966665 has 4 divisors (see below), whose sum is σ = 16293560004. Its totient is φ = 10862373328.

The previous prime is 13577966653. The next prime is 13577966669. The reversal of 13577966665 is 56666977531.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3039096384 + 10538870281 = 55128^2 + 102659^2 .

It is a cyclic number.

It is not a de Polignac number, because 13577966665 - 2⁷ = 13577966537 is a prime.

It is a super-2 number, since 2×13577966665² (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 (13577966669) 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, 1357796662 + ... + 1357796671.

It is an arithmetic number, because the mean of its divisors is an integer number (4073390001).

Almost surely, 2^13577966665 is an apocalyptic number.

It is an amenable number.

13577966665 is a deficient number, since it is larger than the sum of its proper divisors (2715593339).

13577966665 is an equidigital number, since it uses as much as digits as its factorization.

13577966665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2715593338.

The product of its digits is 42865200, while the sum is 61.

The spelling of 13577966665 in words is "thirteen billion, five hundred seventy-seven million, nine hundred sixty-six thousand, six hundred sixty-five".