666455543 has 8 divisors (see below), whose sum is σ = 722962128. Its totient is φ = 610697664.

The previous prime is 666455519. The next prime is 666455593. The reversal of 666455543 is 345554666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 666455543 - 2¹⁴ = 666439159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666455494 and 666455503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666455593) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185321 + ... + 188882.

It is an arithmetic number, because the mean of its divisors is an integer number (90370266).

Almost surely, 2^666455543 is an apocalyptic number.

666455543 is a deficient number, since it is larger than the sum of its proper divisors (56506585).

666455543 is a wasteful number, since it uses less digits than its factorization.

666455543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374353.

The product of its digits is 1296000, while the sum is 44.

The square root of 666455543 is about 25815.8002587563. The cubic root of 666455543 is about 873.4882382446.

The spelling of 666455543 in words is "six hundred sixty-six million, four hundred fifty-five thousand, five hundred forty-three".