1866044743749 has 40 divisors (see below), whose sum is σ = 2916987175872. Its totient is φ = 1186570218240.

The previous prime is 1866044743747. The next prime is 1866044743781. The reversal of 1866044743749 is 9473474406681.

1866044743749 is a `hidden beast` number, since 1 + 86 + 6 + 0 + 447 + 43 + 74 + 9 = 666.

It is not a de Polignac number, because 1866044743749 - 2¹ = 1866044743747 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866044743741) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 761107 + ... + 2076384.

Almost surely, 2^{1866044743749} is an apocalyptic number.

It is an amenable number.

1866044743749 is a deficient number, since it is larger than the sum of its proper divisors (1050942432123).

1866044743749 is a wasteful number, since it uses less digits than its factorization.

1866044743749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2837879 (or 2837870 counting only the distinct ones).

The product of its (nonzero) digits is 97542144, while the sum is 63.

The spelling of 1866044743749 in words is "one trillion, eight hundred sixty-six billion, forty-four million, seven hundred forty-three thousand, seven hundred forty-nine".