2689913665 has 4 divisors (see below), whose sum is σ = 3227896404. Its totient is φ = 2151930928.

The previous prime is 2689913659. The next prime is 2689913671. The reversal of 2689913665 is 5663199862.

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

It is an interprime number because it is at equal distance from previous prime (2689913659) and next prime (2689913671).

It can be written as a sum of positive squares in 2 ways, for example, as 517608001 + 2172305664 = 22751^2 + 46608^2 .

It is a cyclic number.

It is not a de Polignac number, because 2689913665 - 2¹⁷ = 2689782593 is a prime.

It is a super-3 number, since 3×2689913665³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268991362 + ... + 268991371.

It is an arithmetic number, because the mean of its divisors is an integer number (806974101).

Almost surely, 2^2689913665 is an apocalyptic number.

It is an amenable number.

2689913665 is a deficient number, since it is larger than the sum of its proper divisors (537982739).

2689913665 is an equidigital number, since it uses as much as digits as its factorization.

2689913665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537982738.

The product of its digits is 4199040, while the sum is 55.

The square root of 2689913665 is about 51864.3776112275. The cubic root of 2689913665 is about 1390.7405375469.

The spelling of 2689913665 in words is "two billion, six hundred eighty-nine million, nine hundred thirteen thousand, six hundred sixty-five".