2521966261 has 4 divisors (see below), whose sum is σ = 2631616992. Its totient is φ = 2412315532.

The previous prime is 2521966253. The next prime is 2521966309. The reversal of 2521966261 is 1626691252.

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.

It is not a de Polignac number, because 2521966261 - 2³ = 2521966253 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2521966961) 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, 54825331 + ... + 54825376.

It is an arithmetic number, because the mean of its divisors is an integer number (657904248).

Almost surely, 2^2521966261 is an apocalyptic number.

It is an amenable number.

2521966261 is a deficient number, since it is larger than the sum of its proper divisors (109650731).

2521966261 is a wasteful number, since it uses less digits than its factorization.

2521966261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109650730.

The product of its digits is 77760, while the sum is 40.

The square root of 2521966261 is about 50219.1822016249. The cubic root of 2521966261 is about 1361.1722629490.

The spelling of 2521966261 in words is "two billion, five hundred twenty-one million, nine hundred sixty-six thousand, two hundred sixty-one".