13667040785 has 4 divisors (see below), whose sum is σ = 16400448948. Its totient is φ = 10933632624.

The previous prime is 13667040763. The next prime is 13667040787. The reversal of 13667040785 is 58704076631.

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 1752008449 + 11915032336 = 41857^2 + 109156^2 .

It is a cyclic number.

It is not a de Polignac number, because 13667040785 - 2¹² = 13667036689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13667040787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1366704074 + ... + 1366704083.

It is an arithmetic number, because the mean of its divisors is an integer number (4100112237).

Almost surely, 2^13667040785 is an apocalyptic number.

It is an amenable number.

13667040785 is a deficient number, since it is larger than the sum of its proper divisors (2733408163).

13667040785 is an equidigital number, since it uses as much as digits as its factorization.

13667040785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2733408162.

The product of its (nonzero) digits is 846720, while the sum is 47.

The spelling of 13667040785 in words is "thirteen billion, six hundred sixty-seven million, forty thousand, seven hundred eighty-five".