666661030 has 32 divisors (see below), whose sum is σ = 1397300544. Its totient is φ = 224255616.

The previous prime is 666661007. The next prime is 666661033. The reversal of 666661030 is 30166666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666661033) 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, 86137 + ... + 93556.

It is an arithmetic number, because the mean of its divisors is an integer number (43665642).

Almost surely, 2^666661030 is an apocalyptic number.

666661030 is an abundant number, since it is smaller than the sum of its proper divisors (730639514).

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

666661030 is a wasteful number, since it uses less digits than its factorization.

666661030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179760.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 666661030 is about 25819.7798209047. The cubic root of 666661030 is about 873.5780026884.

The spelling of 666661030 in words is "six hundred sixty-six million, six hundred sixty-one thousand, thirty".