666042652 has 96 divisors (see below), whose sum is σ = 1374912000. Its totient is φ = 279417600.

The previous prime is 666042577. The next prime is 666042653. The reversal of 666042652 is 256240666.

It is a happy number.

It is a super-2 number, since 2×666042652² = 887225628566386208, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666042653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3346849 + ... + 3347047.

It is an arithmetic number, because the mean of its divisors is an integer number (14322000).

Almost surely, 2^666042652 is an apocalyptic number.

It is an amenable number.

666042652 is an abundant number, since it is smaller than the sum of its proper divisors (708869348).

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

666042652 is a wasteful number, since it uses less digits than its factorization.

666042652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347 (or 345 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 666042652 is about 25807.8021536124. The cubic root of 666042652 is about 873.3078161390.

The spelling of 666042652 in words is "six hundred sixty-six million, forty-two thousand, six hundred fifty-two".