1666424144455 has 16 divisors (see below), whose sum is σ = 2308009230144. Its totient is φ = 1131377068800.

The previous prime is 1666424144447. The next prime is 1666424144459. The reversal of 1666424144455 is 5544414246661.

It is not a de Polignac number, because 1666424144455 - 2³ = 1666424144447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666424144459) 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, 235700022 + ... + 235707091.

It is an arithmetic number, because the mean of its divisors is an integer number (144250576884).

Almost surely, 2^{1666424144455} is an apocalyptic number.

1666424144455 is a deficient number, since it is larger than the sum of its proper divisors (641585085689).

1666424144455 is a wasteful number, since it uses less digits than its factorization.

1666424144455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471407226.

The product of its digits is 11059200, while the sum is 52.

The spelling of 1666424144455 in words is "one trillion, six hundred sixty-six billion, four hundred twenty-four million, one hundred forty-four thousand, four hundred fifty-five".