6657784877566 has 16 divisors (see below), whose sum is σ = 10003657321440. Its totient is φ = 3323234027520.

The previous prime is 6657784877561. The next prime is 6657784877617.

6657784877566 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×6657784877566² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6657784877566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6657784877561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8054506 + ... + 8842546.

It is an arithmetic number, because the mean of its divisors is an integer number (625228582590).

Almost surely, 2^{6657784877566} is an apocalyptic number.

6657784877566 is a deficient number, since it is larger than the sum of its proper divisors (3345872443874).

6657784877566 is a wasteful number, since it uses less digits than its factorization.

6657784877566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795219.

The product of its digits is 19914854400, while the sum is 82.

The spelling of 6657784877566 in words is "six trillion, six hundred fifty-seven billion, seven hundred eighty-four million, eight hundred seventy-seven thousand, five hundred sixty-six".