2540562561666 has 48 divisors (see below), whose sum is σ = 5678228746944. Its totient is φ = 820336380192.

The previous prime is 2540562561643. The next prime is 2540562561727. The reversal of 2540562561666 is 6661652650452.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8251150 + ... + 8553513.

It is an arithmetic number, because the mean of its divisors is an integer number (118296432228).

Almost surely, 2^{2540562561666} is an apocalyptic number.

2540562561666 is an abundant number, since it is smaller than the sum of its proper divisors (3137666185278).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2540562561666 is a wasteful number, since it uses less digits than its factorization.

2540562561666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16804935 (or 16804932 counting only the distinct ones).

The product of its (nonzero) digits is 15552000, while the sum is 54.

The spelling of 2540562561666 in words is "two trillion, five hundred forty billion, five hundred sixty-two million, five hundred sixty-one thousand, six hundred sixty-six".