1666116258 has 16 divisors (see below), whose sum is σ = 3364585536. Its totient is φ = 549979920.

The previous prime is 1666116239. The next prime is 1666116307. The reversal of 1666116258 is 8526116661.

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, 1347373 + ... + 1348608.

It is an arithmetic number, because the mean of its divisors is an integer number (210286596).

Almost surely, 2^1666116258 is an apocalyptic number.

1666116258 is an abundant number, since it is smaller than the sum of its proper divisors (1698469278).

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

1666116258 is a wasteful number, since it uses less digits than its factorization.

1666116258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2696089.

The product of its digits is 103680, while the sum is 42.

The square root of 1666116258 is about 40818.0873878236. The cubic root of 1666116258 is about 1185.5005707998.

The spelling of 1666116258 in words is "one billion, six hundred sixty-six million, one hundred sixteen thousand, two hundred fifty-eight".