2665353641 has 4 divisors (see below), whose sum is σ = 2685699984. Its totient is φ = 2645007300.

The previous prime is 2665353637. The next prime is 2665353673. The reversal of 2665353641 is 1463535662.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1463535662 = 2 ⋅731767831.

It is a cyclic number.

It is not a de Polignac number, because 2665353641 - 2² = 2665353637 is a prime.

It is a super-2 number, since 2×2665353641² = 14208220063183913762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2665350641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10172975 + ... + 10173236.

It is an arithmetic number, because the mean of its divisors is an integer number (671424996).

Almost surely, 2^2665353641 is an apocalyptic number.

It is an amenable number.

2665353641 is a deficient number, since it is larger than the sum of its proper divisors (20346343).

2665353641 is a wasteful number, since it uses less digits than its factorization.

2665353641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20346342.

The product of its digits is 388800, while the sum is 41.

The square root of 2665353641 is about 51627.0630677361. The cubic root of 2665353641 is about 1386.4949110480.

The spelling of 2665353641 in words is "two billion, six hundred sixty-five million, three hundred fifty-three thousand, six hundred forty-one".