6661011 has 24 divisors (see below), whose sum is σ = 10448784. Its totient is φ = 3763200.

The previous prime is 6660977. The next prime is 6661013. The reversal of 6661011 is 1101666.

It is not a de Polignac number, because 6661011 - 2⁹ = 6660499 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

6661011 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6661013) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16411 + ... + 16811.

It is an arithmetic number, because the mean of its divisors is an integer number (435366).

Almost surely, 2^6661011 is an apocalyptic number.

6661011 is a deficient number, since it is larger than the sum of its proper divisors (3787773).

6661011 is a wasteful number, since it uses less digits than its factorization.

6661011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531 (or 524 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 6661011 is about 2580.8934499510. The cubic root of 6661011 is about 188.1539688578.

Adding to 6661011 its reverse (1101666), we get a palindrome (7762677).

The spelling of 6661011 in words is "six million, six hundred sixty-one thousand, eleven".