666061630 has 16 divisors (see below), whose sum is σ = 1291135104. Its totient is φ = 245930400.

The previous prime is 666061619. The next prime is 666061633. The reversal of 666061630 is 36160666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666061633) 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, 2561646 + ... + 2561905.

It is an arithmetic number, because the mean of its divisors is an integer number (80695944).

Almost surely, 2^666061630 is an apocalyptic number.

666061630 is a deficient number, since it is larger than the sum of its proper divisors (625073474).

666061630 is a wasteful number, since it uses less digits than its factorization.

666061630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5123571.

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

The square root of 666061630 is about 25808.1698305013. The cubic root of 666061630 is about 873.3161106420.

The spelling of 666061630 in words is "six hundred sixty-six million, sixty-one thousand, six hundred thirty".