2540555866 has 4 divisors (see below), whose sum is σ = 3810833802. Its totient is φ = 1270277932.

The previous prime is 2540555863. The next prime is 2540555903. The reversal of 2540555866 is 6685550452.

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., 2538043641 + 2512225 = 50379^2 + 1585^2 .

It is not an unprimeable number, because it can be changed into a prime (2540555861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 635138965 + ... + 635138968.

Almost surely, 2^2540555866 is an apocalyptic number.

2540555866 is a deficient number, since it is larger than the sum of its proper divisors (1270277936).

2540555866 is a wasteful number, since it uses less digits than its factorization.

2540555866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270277935.

The product of its (nonzero) digits is 1440000, while the sum is 46.

The square root of 2540555866 is about 50403.9270890672. The cubic root of 2540555866 is about 1364.5085138109.

The spelling of 2540555866 in words is "two billion, five hundred forty million, five hundred fifty-five thousand, eight hundred sixty-six".