2578122261 has 48 divisors (see below), whose sum is σ = 4430549760. Its totient is φ = 1423992960.

The previous prime is 2578122257. The next prime is 2578122317. The reversal of 2578122261 is 1622218752.

It is a happy number.

2578122261 is a `hidden beast` number, since 2 + 578 + 1 + 2 + 22 + 61 = 666.

It is not a de Polignac number, because 2578122261 - 2² = 2578122257 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2578122221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 88995 + ... + 114351.

It is an arithmetic number, because the mean of its divisors is an integer number (92303120).

Almost surely, 2^2578122261 is an apocalyptic number.

It is an amenable number.

2578122261 is a deficient number, since it is larger than the sum of its proper divisors (1852427499).

2578122261 is a wasteful number, since it uses less digits than its factorization.

2578122261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25466 (or 25463 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 2578122261 is about 50775.2130571601. The cubic root of 2578122261 is about 1371.2011525198.

The spelling of 2578122261 in words is "two billion, five hundred seventy-eight million, one hundred twenty-two thousand, two hundred sixty-one".