2106666653 has 24 divisors (see below), whose sum is σ = 2663420760. Its totient is φ = 1651466880.

The previous prime is 2106666647. The next prime is 2106666671. The reversal of 2106666653 is 3566666012.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 27489049 + 2079177604 = 5243^2 + 45598^2 .

It is not a de Polignac number, because 2106666653 - 2¹² = 2106662557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2106666653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2106666613) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54263 + ... + 84603.

It is an arithmetic number, because the mean of its divisors is an integer number (110975865).

Almost surely, 2^2106666653 is an apocalyptic number.

It is an amenable number.

2106666653 is a deficient number, since it is larger than the sum of its proper divisors (556754107).

2106666653 is a wasteful number, since it uses less digits than its factorization.

2106666653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30477 (or 30470 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 41.

The square root of 2106666653 is about 45898.4384592766. The cubic root of 2106666653 is about 1281.9328409875.

The spelling of 2106666653 in words is "two billion, one hundred six million, six hundred sixty-six thousand, six hundred fifty-three".