211660551649 has 8 divisors (see below), whose sum is σ = 215137926720. Its totient is φ = 208183419600.

The previous prime is 211660551629. The next prime is 211660551667. The reversal of 211660551649 is 946155066112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 211660551649 - 2¹¹ = 211660549601 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211660551599 and 211660551608.

It is not an unprimeable number, because it can be changed into a prime (211660551629) 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, 2766492 + ... + 2841970.

It is an arithmetic number, because the mean of its divisors is an integer number (26892240840).

Almost surely, 2^211660551649 is an apocalyptic number.

It is an amenable number.

211660551649 is a deficient number, since it is larger than the sum of its proper divisors (3477375071).

211660551649 is an equidigital number, since it uses as much as digits as its factorization.

211660551649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121511.

The product of its (nonzero) digits is 388800, while the sum is 46.

The spelling of 211660551649 in words is "two hundred eleven billion, six hundred sixty million, five hundred fifty-one thousand, six hundred forty-nine".