2100661005266 has 8 divisors (see below), whose sum is σ = 3152421832944. Its totient is φ = 1049853727620.

The previous prime is 2100661005257. The next prime is 2100661005319. The reversal of 2100661005266 is 6625001660012.

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, 238382000 + ... + 238390811.

It is an arithmetic number, because the mean of its divisors is an integer number (394052729118).

Almost surely, 2^{2100661005266} is an apocalyptic number.

2100661005266 is a deficient number, since it is larger than the sum of its proper divisors (1051760827678).

2100661005266 is a wasteful number, since it uses less digits than its factorization.

2100661005266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476775016.

The product of its (nonzero) digits is 25920, while the sum is 35.

Adding to 2100661005266 its reverse (6625001660012), we get a palindrome (8725662665278).

The spelling of 2100661005266 in words is "two trillion, one hundred billion, six hundred sixty-one million, five thousand, two hundred sixty-six".