6651770771566 has 4 divisors (see below), whose sum is σ = 9977656157352. Its totient is φ = 3325885385782.

The previous prime is 6651770771561. The next prime is 6651770771567.

It is a happy number.

6651770771566 is nontrivially palindromic in base 10.

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

It is a junction number, because it is equal to n+sod(n) for n = 6651770771498 and 6651770771507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6651770771561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1662942692890 + ... + 1662942692893.

It is an arithmetic number, because the mean of its divisors is an integer number (2494414039338).

Almost surely, 2^{6651770771566} is an apocalyptic number.

6651770771566 is a deficient number, since it is larger than the sum of its proper divisors (3325885385786).

6651770771566 is a wasteful number, since it uses less digits than its factorization.

6651770771566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3325885385785.

The product of its (nonzero) digits is 77792400, while the sum is 64.

The spelling of 6651770771566 in words is "six trillion, six hundred fifty-one billion, seven hundred seventy million, seven hundred seventy-one thousand, five hundred sixty-six".