6645492211 has 4 divisors (see below), whose sum is σ = 6679225872. Its totient is φ = 6611758552.

The previous prime is 6645492179. The next prime is 6645492229. The reversal of 6645492211 is 1122945466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6645492211 - 2⁵ = 6645492179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6645492251) 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, 16866535 + ... + 16866928.

It is an arithmetic number, because the mean of its divisors is an integer number (1669806468).

Almost surely, 2^6645492211 is an apocalyptic number.

6645492211 is a deficient number, since it is larger than the sum of its proper divisors (33733661).

6645492211 is a wasteful number, since it uses less digits than its factorization.

6645492211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33733660.

The product of its digits is 103680, while the sum is 40.

The square root of 6645492211 is about 81519.8884383437. Note that the first 3 decimals coincide. The cubic root of 6645492211 is about 1880.0773518611.

The spelling of 6645492211 in words is "six billion, six hundred forty-five million, four hundred ninety-two thousand, two hundred eleven".