666254242 has 24 divisors (see below), whose sum is σ = 1075138560. Its totient is φ = 309541440.

The previous prime is 666254213. The next prime is 666254249. The reversal of 666254242 is 242452666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666254249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38367 + ... + 52957.

It is an arithmetic number, because the mean of its divisors is an integer number (44797440).

Almost surely, 2^666254242 is an apocalyptic number.

666254242 is a deficient number, since it is larger than the sum of its proper divisors (408884318).

666254242 is a wasteful number, since it uses less digits than its factorization.

666254242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14706 (or 14689 counting only the distinct ones).

The product of its digits is 138240, while the sum is 37.

The square root of 666254242 is about 25811.9011698092. The cubic root of 666254242 is about 873.4002845098.

The spelling of 666254242 in words is "six hundred sixty-six million, two hundred fifty-four thousand, two hundred forty-two".