1666630626 has 16 divisors (see below), whose sum is σ = 3334523328. Its totient is φ = 555333200.

The previous prime is 1666630613. The next prime is 1666630673. The reversal of 1666630626 is 6260366661.

It is a happy number.

1666630626 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34965 + ... + 67496.

It is an arithmetic number, because the mean of its divisors is an integer number (208407708).

Almost surely, 2^1666630626 is an apocalyptic number.

1666630626 is an abundant number, since it is smaller than the sum of its proper divisors (1667892702).

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

1666630626 is a wasteful number, since it uses less digits than its factorization.

1666630626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105177.

The product of its (nonzero) digits is 279936, while the sum is 42.

The square root of 1666630626 is about 40824.3876377834. The cubic root of 1666630626 is about 1185.6225552480.

The spelling of 1666630626 in words is "one billion, six hundred sixty-six million, six hundred thirty thousand, six hundred twenty-six".