1666099902 has 8 divisors (see below), whose sum is σ = 3332199816. Its totient is φ = 555366632.

The previous prime is 1666099901. The next prime is 1666099907. The reversal of 1666099902 is 2099906661.

It is a happy number.

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

1666099902 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1666099901) 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, 138841653 + ... + 138841664.

It is an arithmetic number, because the mean of its divisors is an integer number (416524977).

Almost surely, 2^1666099902 is an apocalyptic number.

1666099902 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.

1666099902 is a wasteful number, since it uses less digits than its factorization.

1666099902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277683322.

The product of its (nonzero) digits is 314928, while the sum is 48.

The square root of 1666099902 is about 40817.8870349752. The cubic root of 1666099902 is about 1185.4966914966.

The spelling of 1666099902 in words is "one billion, six hundred sixty-six million, ninety-nine thousand, nine hundred two".