6661977 has 16 divisors (see below), whose sum is σ = 10749312. Its totient is φ = 3582720.

The previous prime is 6661957. The next prime is 6661987. The reversal of 6661977 is 7791666.

It is not a de Polignac number, because 6661977 - 2⁷ = 6661849 is a prime.

6661977 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6661957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8974 + ... + 9687.

It is an arithmetic number, because the mean of its divisors is an integer number (671832).

Almost surely, 2^6661977 is an apocalyptic number.

It is an amenable number.

6661977 is a deficient number, since it is larger than the sum of its proper divisors (4087335).

6661977 is a wasteful number, since it uses less digits than its factorization.

6661977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18688.

The product of its digits is 95256, while the sum is 42.

The square root of 6661977 is about 2581.0805876609. The cubic root of 6661977 is about 188.1630639711.

The spelling of 6661977 in words is "six million, six hundred sixty-one thousand, nine hundred seventy-seven".