56666688888871 has 2 divisors, whose sum is σ = 56666688888872. Its totient is φ = 56666688888870.

The previous prime is 56666688888839. The next prime is 56666688888961. The reversal of 56666688888871 is 17888888666665.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56666688888871 - 2⁵ = 56666688888839 is a prime.

It is a super-2 number, since 2×56666688888871² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56666688888811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28333344444435 + 28333344444436.

It is an arithmetic number, because the mean of its divisors is an integer number (28333344444436).

Almost surely, 2^{56666688888871} is an apocalyptic number.

56666688888871 is a deficient number, since it is larger than the sum of its proper divisors (1).

56666688888871 is an equidigital number, since it uses as much as digits as its factorization.

56666688888871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 71345111040, while the sum is 91.

The spelling of 56666688888871 in words is "fifty-six trillion, six hundred sixty-six billion, six hundred eighty-eight million, eight hundred eighty-eight thousand, eight hundred seventy-one".