2509409866 has 4 divisors (see below), whose sum is σ = 3764114802. Its totient is φ = 1254704932.

The previous prime is 2509409839. The next prime is 2509409869. The reversal of 2509409866 is 6689049052.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1670438641 + 838971225 = 40871^2 + 28965^2 .

It is not an unprimeable number, because it can be changed into a prime (2509409869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627352465 + ... + 627352468.

Almost surely, 2^2509409866 is an apocalyptic number.

2509409866 is a deficient number, since it is larger than the sum of its proper divisors (1254704936).

2509409866 is a wasteful number, since it uses less digits than its factorization.

2509409866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1254704935.

The product of its (nonzero) digits is 933120, while the sum is 49.

The square root of 2509409866 is about 50094.0102806713. The cubic root of 2509409866 is about 1358.9094967149.

The spelling of 2509409866 in words is "two billion, five hundred nine million, four hundred nine thousand, eight hundred sixty-six".