2100066649 has 2 divisors, whose sum is σ = 2100066650. Its totient is φ = 2100066648.

The previous prime is 2100066641. The next prime is 2100066653. The reversal of 2100066649 is 9466600012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1738306249 + 361760400 = 41693^2 + 19020^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100066649 - 2³ = 2100066641 is a prime.

It is not a weakly prime, because it can be changed into another prime (2100066641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050033324 + 1050033325.

It is an arithmetic number, because the mean of its divisors is an integer number (1050033325).

Almost surely, 2^2100066649 is an apocalyptic number.

It is an amenable number.

2100066649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2100066649 is an equidigital number, since it uses as much as digits as its factorization.

2100066649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 2100066649 is about 45826.4841439969. The cubic root of 2100066649 is about 1280.5927123554.

The spelling of 2100066649 in words is "two billion, one hundred million, sixty-six thousand, six hundred forty-nine".