2166502666 has 8 divisors (see below), whose sum is σ = 3255762564. Its totient is φ = 1081248480.

The previous prime is 2166502649. The next prime is 2166502717. The reversal of 2166502666 is 6662056612.

It can be written as a sum of positive squares in 2 ways, for example, as 1786837441 + 379665225 = 42271^2 + 19485^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1000075 + ... + 1002238.

Almost surely, 2^2166502666 is an apocalyptic number.

2166502666 is a deficient number, since it is larger than the sum of its proper divisors (1089259898).

2166502666 is a wasteful number, since it uses less digits than its factorization.

2166502666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2002856.

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

The square root of 2166502666 is about 46545.7051294746. The cubic root of 2166502666 is about 1293.9566968063.

The spelling of 2166502666 in words is "two billion, one hundred sixty-six million, five hundred two thousand, six hundred sixty-six".