666510042 has 16 divisors (see below), whose sum is σ = 1454203872. Its totient is φ = 201972720.

The previous prime is 666510029. The next prime is 666510049. The reversal of 666510042 is 240015666.

It is a junction number, because it is equal to n+sod(n) for n = 666509991 and 666510009.

It is not an unprimeable number, because it can be changed into a prime (666510049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5049253 + ... + 5049384.

It is an arithmetic number, because the mean of its divisors is an integer number (90887742).

Almost surely, 2^666510042 is an apocalyptic number.

666510042 is an abundant number, since it is smaller than the sum of its proper divisors (787693830).

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

666510042 is a wasteful number, since it uses less digits than its factorization.

666510042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10098653.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 666510042 is about 25816.8557729248. The cubic root of 666510042 is about 873.5120472535.

The spelling of 666510042 in words is "six hundred sixty-six million, five hundred ten thousand, forty-two".