6656820477 has 4 divisors (see below), whose sum is σ = 8875760640. Its totient is φ = 4437880316.

The previous prime is 6656820473. The next prime is 6656820481. The reversal of 6656820477 is 7740286566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (6656820473) and next prime (6656820481).

It is a cyclic number.

It is not a de Polignac number, because 6656820477 - 2² = 6656820473 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6656820473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1109470077 + ... + 1109470082.

It is an arithmetic number, because the mean of its divisors is an integer number (2218940160).

Almost surely, 2^6656820477 is an apocalyptic number.

It is an amenable number.

6656820477 is a deficient number, since it is larger than the sum of its proper divisors (2218940163).

6656820477 is a wasteful number, since it uses less digits than its factorization.

6656820477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2218940162.

The product of its (nonzero) digits is 3386880, while the sum is 51.

The square root of 6656820477 is about 81589.3404618520. The cubic root of 6656820477 is about 1881.1450393098.

The spelling of 6656820477 in words is "six billion, six hundred fifty-six million, eight hundred twenty thousand, four hundred seventy-seven".