1666790106 has 8 divisors (see below), whose sum is σ = 3333580224. Its totient is φ = 555596700.

The previous prime is 1666790101. The next prime is 1666790117. The reversal of 1666790106 is 6010976661.

It is a sphenic number, since it is the product of 3 distinct primes.

1666790106 is an admirable number.

It is a super-5 number, since 5×1666790106⁵ (a number of 47 digits) contains 55555 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1666790101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138899170 + ... + 138899181.

It is an arithmetic number, because the mean of its divisors is an integer number (416697528).

Almost surely, 2^1666790106 is an apocalyptic number.

1666790106 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1666790106 is a wasteful number, since it uses less digits than its factorization.

1666790106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277798356.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 1666790106 is about 40826.3408352990. The cubic root of 1666790106 is about 1185.6603714766.

The spelling of 1666790106 in words is "one billion, six hundred sixty-six million, seven hundred ninety thousand, one hundred six".