2645127261 has 36 divisors (see below), whose sum is σ = 4464281952. Its totient is φ = 1504785744.

The previous prime is 2645127203. The next prime is 2645127263. The reversal of 2645127261 is 1627215462.

It is a happy number.

2645127261 is a `hidden beast` number, since 2 + 645 + 1 + 2 + 7 + 2 + 6 + 1 = 666.

It is not a de Polignac number, because 2645127261 - 2¹¹ = 2645125213 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2645127263) 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 35 ways as a sum of consecutive naturals, for example, 86896 + ... + 113318.

It is an arithmetic number, because the mean of its divisors is an integer number (124007832).

Almost surely, 2^2645127261 is an apocalyptic number.

2645127261 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2645127261 is a deficient number, since it is larger than the sum of its proper divisors (1819154691).

2645127261 is a wasteful number, since it uses less digits than its factorization.

2645127261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26670 (or 26660 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 2645127261 is about 51430.8007034695. The cubic root of 2645127261 is about 1382.9788033385.

The spelling of 2645127261 in words is "two billion, six hundred forty-five million, one hundred twenty-seven thousand, two hundred sixty-one".