666634854 has 16 divisors (see below), whose sum is σ = 1334842992. Its totient is φ = 221949408.

The previous prime is 666634853. The next prime is 666634879. The reversal of 666634854 is 458436666.

666634854 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666634853) 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, 60009 + ... + 70244.

It is an arithmetic number, because the mean of its divisors is an integer number (83427687).

Almost surely, 2^666634854 is an apocalyptic number.

666634854 is an abundant number, since it is smaller than the sum of its proper divisors (668208138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666634854 is a wasteful number, since it uses less digits than its factorization.

666634854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131111.

The product of its digits is 2488320, while the sum is 48.

The square root of 666634854 is about 25819.2729177256. The cubic root of 666634854 is about 873.5665690532.

It can be divided in two parts, 66663 and 4854, that added together give a palindrome (71517).

The spelling of 666634854 in words is "six hundred sixty-six million, six hundred thirty-four thousand, eight hundred fifty-four".