2106666654 has 8 divisors (see below), whose sum is σ = 4213333320. Its totient is φ = 702222216.

The previous prime is 2106666647. The next prime is 2106666671. The reversal of 2106666654 is 4566666012.

It is a happy number.

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

2106666654 is an admirable number.

It is a congruent number.

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, 175555549 + ... + 175555560.

It is an arithmetic number, because the mean of its divisors is an integer number (526666665).

Almost surely, 2^2106666654 is an apocalyptic number.

2106666654 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.

2106666654 is a wasteful number, since it uses less digits than its factorization.

2106666654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351111114.

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 2106666654 is about 45898.4384701702. The cubic root of 2106666654 is about 1281.9328411904.

The spelling of 2106666654 in words is "two billion, one hundred six million, six hundred sixty-six thousand, six hundred fifty-four".