666834138 has 24 divisors (see below), whose sum is σ = 1445708628. Its totient is φ = 222139392.

The previous prime is 666834137. The next prime is 666834143. The reversal of 666834138 is 831438666.

It can be written as a sum of positive squares in 2 ways, for example, as 612414009 + 54420129 = 24747^2 + 7377^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 666834093 and 666834102.

It is not an unprimeable number, because it can be changed into a prime (666834137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20506 + ... + 41882.

Almost surely, 2^666834138 is an apocalyptic number.

666834138 is an abundant number, since it is smaller than the sum of its proper divisors (778874490).

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

666834138 is a wasteful number, since it uses less digits than its factorization.

666834138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23118 (or 23115 counting only the distinct ones).

The product of its digits is 497664, while the sum is 45.

The square root of 666834138 is about 25823.1318394962. The cubic root of 666834138 is about 873.6536084545.

The spelling of 666834138 in words is "six hundred sixty-six million, eight hundred thirty-four thousand, one hundred thirty-eight".