2101961566 has 8 divisors (see below), whose sum is σ = 3338409600. Its totient is φ = 989158368.

The previous prime is 2101961551. The next prime is 2101961567. The reversal of 2101961566 is 6651691012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101961567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30911166 + ... + 30911233.

It is an arithmetic number, because the mean of its divisors is an integer number (417301200).

Almost surely, 2^2101961566 is an apocalyptic number.

2101961566 is a deficient number, since it is larger than the sum of its proper divisors (1236448034).

2101961566 is a wasteful number, since it uses less digits than its factorization.

2101961566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61822418.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 2101961566 is about 45847.1543937026. The cubic root of 2101961566 is about 1280.9777616286.

The spelling of 2101961566 in words is "two billion, one hundred one million, nine hundred sixty-one thousand, five hundred sixty-six".