6566238693977 has 4 divisors (see below), whose sum is σ = 6568820780160. Its totient is φ = 6563656607796.

The previous prime is 6566238693923. The next prime is 6566238693979. The reversal of 6566238693977 is 7793968326656.

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 a cyclic number.

It is not a de Polignac number, because 6566238693977 - 2¹⁰ = 6566238692953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6566238693898 and 6566238693907.

It is not an unprimeable number, because it can be changed into a prime (6566238693979) 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, 1291039277 + ... + 1291044362.

It is an arithmetic number, because the mean of its divisors is an integer number (1642205195040).

Almost surely, 2^{6566238693977} is an apocalyptic number.

It is an amenable number.

6566238693977 is a deficient number, since it is larger than the sum of its proper divisors (2582086183).

6566238693977 is a wasteful number, since it uses less digits than its factorization.

6566238693977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2582086182.

The product of its digits is 3703553280, while the sum is 77.

The spelling of 6566238693977 in words is "six trillion, five hundred sixty-six billion, two hundred thirty-eight million, six hundred ninety-three thousand, nine hundred seventy-seven".