1866427711447 has 16 divisors (see below), whose sum is σ = 2024573931072. Its totient is φ = 1710389525760.

The previous prime is 1866427711433. The next prime is 1866427711451. The reversal of 1866427711447 is 7441177246681.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1866427711447 - 2¹⁹ = 1866427187159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1866427711391 and 1866427711400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866427711427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1190947 + ... + 2269627.

It is an arithmetic number, because the mean of its divisors is an integer number (126535870692).

Almost surely, 2^{1866427711447} is an apocalyptic number.

1866427711447 is a deficient number, since it is larger than the sum of its proper divisors (158146219625).

1866427711447 is a wasteful number, since it uses less digits than its factorization.

1866427711447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079658.

The product of its digits is 12644352, while the sum is 58.

The spelling of 1866427711447 in words is "one trillion, eight hundred sixty-six billion, four hundred twenty-seven million, seven hundred eleven thousand, four hundred forty-seven".