56781117766 has 8 divisors (see below), whose sum is σ = 85210274880. Its totient is φ = 28377692808.

The previous prime is 56781117737. The next prime is 56781117779. The reversal of 56781117766 is 66771118765.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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, 6427521 + ... + 6436348.

It is an arithmetic number, because the mean of its divisors is an integer number (10651284360).

Almost surely, 2^56781117766 is an apocalyptic number.

56781117766 is a deficient number, since it is larger than the sum of its proper divisors (28429157114).

56781117766 is a wasteful number, since it uses less digits than its factorization.

56781117766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12866078.

The product of its digits is 2963520, while the sum is 55.

Subtracting 56781117766 from its reverse (66771118765), we obtain a palindrome (9990000999).

The spelling of 56781117766 in words is "fifty-six billion, seven hundred eighty-one million, one hundred seventeen thousand, seven hundred sixty-six".