1666412635 has 8 divisors (see below), whose sum is σ = 2019494736. Its totient is φ = 1319930400.

The previous prime is 1666412621. The next prime is 1666412647. The reversal of 1666412635 is 5362146661.

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

It is not a de Polignac number, because 1666412635 - 2⁵ = 1666412603 is a prime.

It is a Duffinian number.

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, 1649409 + ... + 1650418.

It is an arithmetic number, because the mean of its divisors is an integer number (252436842).

Almost surely, 2^1666412635 is an apocalyptic number.

1666412635 is a deficient number, since it is larger than the sum of its proper divisors (353082101).

1666412635 is a wasteful number, since it uses less digits than its factorization.

1666412635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3299933.

The product of its digits is 155520, while the sum is 40.

The square root of 1666412635 is about 40821.7176880150. The cubic root of 1666412635 is about 1185.5708608670.

The spelling of 1666412635 in words is "one billion, six hundred sixty-six million, four hundred twelve thousand, six hundred thirty-five".