2101906657 has 8 divisors (see below), whose sum is σ = 2124188352. Its totient is φ = 2079654000.

The previous prime is 2101906643. The next prime is 2101906687. The reversal of 2101906657 is 7566091012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2101906657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2101906637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157932 + ... + 170722.

It is an arithmetic number, because the mean of its divisors is an integer number (265523544).

Almost surely, 2^2101906657 is an apocalyptic number.

It is an amenable number.

2101906657 is a deficient number, since it is larger than the sum of its proper divisors (22281695).

2101906657 is a wasteful number, since it uses less digits than its factorization.

2101906657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14519.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 2101906657 is about 45846.5555630955. Note that the first 4 decimals coincide. The cubic root of 2101906657 is about 1280.9666073142.

Adding to 2101906657 its reverse (7566091012), we get a palindrome (9667997669).

The spelling of 2101906657 in words is "two billion, one hundred one million, nine hundred six thousand, six hundred fifty-seven".