2665151281 has 4 divisors (see below), whose sum is σ = 2870162932. Its totient is φ = 2460139632.

The previous prime is 2665151213. The next prime is 2665151297. The reversal of 2665151281 is 1821515662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1821515662 = 2 ⋅910757831.

It can be written as a sum of positive squares in 2 ways, for example, as 709742881 + 1955408400 = 26641^2 + 44220^2 .

It is a cyclic number.

It is not a de Polignac number, because 2665151281 - 2⁹ = 2665150769 is a prime.

It is a super-2 number, since 2×2665151281² = 14206062701231881922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2665151281.

It is not an unprimeable number, because it can be changed into a prime (2665151581) 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, 102505806 + ... + 102505831.

It is an arithmetic number, because the mean of its divisors is an integer number (717540733).

Almost surely, 2^2665151281 is an apocalyptic number.

It is an amenable number.

2665151281 is a deficient number, since it is larger than the sum of its proper divisors (205011651).

2665151281 is a wasteful number, since it uses less digits than its factorization.

2665151281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205011650.

The product of its digits is 28800, while the sum is 37.

The square root of 2665151281 is about 51625.1032057080. The cubic root of 2665151281 is about 1386.4598214941.

The spelling of 2665151281 in words is "two billion, six hundred sixty-five million, one hundred fifty-one thousand, two hundred eighty-one".