2686465781 has 4 divisors (see below), whose sum is σ = 2686745964. Its totient is φ = 2686185600.

The previous prime is 2686465763. The next prime is 2686465811. The reversal of 2686465781 is 1875646862.

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 325477681 + 2360988100 = 18041^2 + 48590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2686465781 is a prime.

It is a super-2 number, since 2×2686465781² = 14434196784967879922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2686465741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125180 + ... + 145061.

It is an arithmetic number, because the mean of its divisors is an integer number (671686491).

Almost surely, 2^2686465781 is an apocalyptic number.

It is an amenable number.

2686465781 is a deficient number, since it is larger than the sum of its proper divisors (280183).

2686465781 is an equidigital number, since it uses as much as digits as its factorization.

2686465781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280182.

The product of its digits is 3870720, while the sum is 53.

The square root of 2686465781 is about 51831.1275296998. The cubic root of 2686465781 is about 1390.1460745680.

The spelling of 2686465781 in words is "two billion, six hundred eighty-six million, four hundred sixty-five thousand, seven hundred eighty-one".