2265187681 has 4 divisors (see below), whose sum is σ = 2265788052. Its totient is φ = 2264587312.

The previous prime is 2265187663. The next prime is 2265187697. The reversal of 2265187681 is 1867815622.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1867815622 = 2 ⋅933907811.

It can be written as a sum of positive squares in 2 ways, for example, as 41216400 + 2223971281 = 6420^2 + 47159^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2265187681 is a prime.

It is a super-2 number, since 2×2265187681² = 10262150460308315522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2265107681) 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, 294490 + ... + 302083.

It is an arithmetic number, because the mean of its divisors is an integer number (566447013).

Almost surely, 2^2265187681 is an apocalyptic number.

It is an amenable number.

2265187681 is a deficient number, since it is larger than the sum of its proper divisors (600371).

2265187681 is an equidigital number, since it uses as much as digits as its factorization.

2265187681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600370.

The product of its digits is 322560, while the sum is 46.

The square root of 2265187681 is about 47593.9878661160. The cubic root of 2265187681 is about 1313.3124571666.

The spelling of 2265187681 in words is "two billion, two hundred sixty-five million, one hundred eighty-seven thousand, six hundred eighty-one".