666542030 has 32 divisors (see below), whose sum is σ = 1495825920. Its totient is φ = 207753120.

The previous prime is 666541987. The next prime is 666542033. The reversal of 666542030 is 30245666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666542033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 432050 + ... + 433589.

It is an arithmetic number, because the mean of its divisors is an integer number (46744560).

Almost surely, 2^666542030 is an apocalyptic number.

666542030 is an abundant number, since it is smaller than the sum of its proper divisors (829283890).

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

666542030 is a wasteful number, since it uses less digits than its factorization.

666542030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865664.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 666542030 is about 25817.4752832263. The cubic root of 666542030 is about 873.5260212647.

Adding to 666542030 its reverse (30245666), we get a palindrome (696787696).

The spelling of 666542030 in words is "six hundred sixty-six million, five hundred forty-two thousand, thirty".