2618844140666 has 16 divisors (see below), whose sum is σ = 4234227905544. Its totient is φ = 1207615189824.

The previous prime is 2618844140651. The next prime is 2618844140677. The reversal of 2618844140666 is 6660414488162.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1412425287025 + 1206418853641 = 1188455^2 + 1098371^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45058145 + ... + 45116228.

Almost surely, 2^{2618844140666} is an apocalyptic number.

2618844140666 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2618844140666 is a deficient number, since it is larger than the sum of its proper divisors (1615383764878).

2618844140666 is a wasteful number, since it uses less digits than its factorization.

2618844140666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90175505.

The product of its (nonzero) digits is 10616832, while the sum is 56.

The spelling of 2618844140666 in words is "two trillion, six hundred eighteen billion, eight hundred forty-four million, one hundred forty thousand, six hundred sixty-six".