2575278261 has 12 divisors (see below), whose sum is σ = 3766934080. Its totient is φ = 1695119400.

The previous prime is 2575278253. The next prime is 2575278287. The reversal of 2575278261 is 1628725752.

2575278261 is a `hidden beast` number, since 2 + 575 + 2 + 78 + 2 + 6 + 1 = 666.

It is not a de Polignac number, because 2575278261 - 2³ = 2575278253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2575278161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1810315 + ... + 1811736.

Almost surely, 2^2575278261 is an apocalyptic number.

It is an amenable number.

2575278261 is a deficient number, since it is larger than the sum of its proper divisors (1191655819).

2575278261 is a wasteful number, since it uses less digits than its factorization.

2575278261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3622136 (or 3622133 counting only the distinct ones).

The product of its digits is 470400, while the sum is 45.

The square root of 2575278261 is about 50747.1995384967. The cubic root of 2575278261 is about 1370.6967633407.

The spelling of 2575278261 in words is "two billion, five hundred seventy-five million, two hundred seventy-eight thousand, two hundred sixty-one".