252018666 has 24 divisors (see below), whose sum is σ = 546873444. Its totient is φ = 83878080.

The previous prime is 252018661. The next prime is 252018667. The reversal of 252018666 is 666810252.

It can be written as a sum of positive squares in 2 ways, for example, as 248724441 + 3294225 = 15771^2 + 1815^2 .

It is a zygodrome in base 4.

It is a self number, because there is not a number n which added to its sum of digits gives 252018666.

It is not an unprimeable number, because it can be changed into a prime (252018661) 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, 1846 + ... + 22526.

Almost surely, 2^252018666 is an apocalyptic number.

252018666 is an abundant number, since it is smaller than the sum of its proper divisors (294854778).

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

252018666 is a wasteful number, since it uses less digits than its factorization.

252018666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21366 (or 21363 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 252018666 is about 15875.0957792386. The cubic root of 252018666 is about 631.6515547732.

It can be divided in two parts, 2520186 and 66, that added together give a palindrome (2520252).

The spelling of 252018666 in words is "two hundred fifty-two million, eighteen thousand, six hundred sixty-six".